The Journal of the American Bamboo Society
Volume 19
BAMBOO SCIENCE
&
CULTURE
The Journal of the American Bamboo Society
is published by the
American Bamboo Society
Copyright 2005
ISSN 0197– 3789
Bamboo Science and Culture: The Journal of the American Bamboo Society
is the continuation of The Journal of the American Bamboo Society
President of the Society
Gerald Morris
Vice President
Dave Flanagan
Treasurer
Sue Turtle
Secretary
David King
Membership
Michael Bartholomew
Board of Directors
Michael Bartholomew
Kinder Chambers
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Dave Flanagan
Ned Jaquith
David King
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Gerald Morris
Mary Ann Silverman
Steve Stamper
Chris Stapleton
Mike Turner
JoAnne Wyman
Membership Information
Membership in the American Bamboo Society and one ABS chapter is for the calendar year and includes a
subscription to the bimonthly Newsletter and annual Journal.
See http://www.bamboo.org for current rates or contact
Michael Bartholomew, 750 Krumkill Rd. Albany NY 12203-5976.
On the cover: Arundinaria gigantea habit with leaf and branch complement insets, from the population described by
Platt et.al. on pgs. 30-31 of this issue. Photo by G.F. Guala.
Bamboo Science and Culture:
The Journal of the American Bamboo Society 19(1): 1-4
© Copyright 2005 by the American Bamboo Society
Distribution of starch in the culms of Bambusa bambos (L.) Voss
and its influence on borer damage
Bhat, K.V., Varma, R.V., Raju Paduvil, Pandalai, R.C.,
and Santhoshkumar, R.
Kerala Forest Research Institute, Peechi – 680 653, Kerala, India
Email: kvbhat@kfri.org, rvvarma@kfri.org, rcp@kfri.org
Borer damage to bamboo culms both during storage and use is generally attributed to starch
stored in the culm tissues. In order to elucidate the possible reasons for more severe tunneling by
borers through the inner part of the culm wall than the outer part, the present study was conducted
on five mature culms of Bambusa bambos (L.) Voss. The results indicated higher quantity of
starch in the inner portion of the culm wall. It was also found that this portion had a lower
proportion of fibrous tissue and a higher proportion of ground parenchyma which facilitates
abundant starch storage.
Freshly felled bamboo culms are generally
prone to damage from insect borers, which
reduce the material into a powdery mass within
a few weeks. Borer infestation is a serious
problem in bamboo growing countries such as
India. Due to this, an enormous quantity of raw
material is lost every year. The common
species of borer beetles causing serious damage
are Dinoderus brevis Horn., D. ocellaris Steph.
and D. minutus Fab. (Coleoptera: Bostrychidae)
which are popularly known as ghoon borers in
India (Beeson, 1941; Sen Sarma, 1977). Although
there are various beliefs with regard to the
susceptibility of bamboo to borer infestation,
starch content is often regarded as a predisposing
factor for the borer incidence and several studies
have correlated the borer attack with the
occurrence of starch in bamboo (Plank and
Hageman, 1951, Joseph 1958, Nair et al. 1983,
Dhamodaran et al. 1986, Liese 1980, Mathew
and Nair 1994). More recent information on the
variability of starch content in bamboo in
relation to season and culm age is available
from studies by Abd. Latif et al. (1994) and
Liese (1998). Many of these studies have
indicated a positive relationship between
storage starch and borer damage and in some
instances, suitable ‘low starch periods’ have
been suggested for harvesting bamboos to
minimize the borer problem (Beeson, 1941;
Sulthoni,1987). The present study was conducted
to understand the pattern of distribution of
starch content across the culm wall and its
relationship to borer infestation patterns in
Bambusa bambos (L.) Voss. The study is based
on the casual observation that the borer tunneling
is generally more concentrated in the inner
portion of the culm wall as compared to the
outer layers (Fig.1).
Figure 1. Cross sectional view of the culm
internode showing the typical pattern of borer
damage in the culm wall.
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Bamboo Science and Culture
Vol. 19
MATERIALS AND METHODS
Culm internodal samples of B. bambos
were collected from different forest areas of
Kerala. For quick verification of starch in culm
samples, iodine-potassium iodide (I2KI) was
used. A 2 per cent solution of I2KI was applied
to the exposed longitudinal surface of the
culm. A bluish coloration developed after the
application indicated the presence of starch.
The samples were stored for periodic observation on borer infestation. Selected portions of
these samples were used for the analysis of
starch content subsequently. Outer and inner
portions of the culm wall from base, mid-height
and top levels of the culms were analyzed
separately. In order to examine the distribution
of starch in culm tissues, microscopic study of
sections was carried out.
Starch content was estimated using the
technique of Humphreys and Kelly (1961). The
samples were powdered in a Wiley mill and the
material sieved through a 200-mesh sieve
(B.S.S.) was used for the analysis. The powder
was then treated with perchloric acid and
centrifuged. An aliquot (10 ml) was placed in a
50 ml volumetric flask, and a solution was
made alkaline with sodium hydroxide. Acetic
acid was used for de-colorization and a further
2.5 ml was added according to the standard
procedure. The colorless solution was allowed
to react with potassium iodide and potassium
iodate for 15 minutes and made up to volume
(50 ml). The absorption and concentration of
the solution was then measured by photoelectric
colorimeter.
The proportions of fibro-vascular and
parenchyma tissues were estimated by tracing
the cross-sectional views on tracing film and
measuring the area occupied by each tissue in
a unit area.
RESULTS AND DISCUSSION
Part of a split culm of B. bambos tested for
starch using iodine reagent is shown in Fig. 2.
In contrast to the inner portion, the outer part of
the culm wall was almost free of dark vertical
Figure 2. Part of a freshly felled split bamboo
tested for starch; dark vertical striations indicate
portions rich in starch.
striations indicative of starch containing cell
strands. A photomicrograph of the inner portion
of the culm wall (Fig.3) shows distribution of
starch in ground parenchyma cells. The fibers
were largely free of starch. Average values of
starch content for outer and inner portions of
the culm wall at different height levels is given
in Table 1. Analysis of variance showed that the
difference in starch content between the culms
and that between height levels was not significant.
However, there was a highly significant (1%
level) difference in starch content between
the outer and inner parts of the culm wall as
shown by paired t-test of the data pooled
together (t = – 4.232).
The typical pattern of borer damage of the
culm wall of B. bambos is shown in Fig.1. It
was found that the damage was more intensive
towards the inner portion of the culm wall that
is rich in starch content. The outer portion
remained nearly sound without much tunneling.
This observation supports the findings of
Plank (1951) that the inner portion of the culm
2005
Bhat et al: Starch in Bambusa bambos culms
Figure 3 L.S. showing distribution of starch in
parenchyma tissue in the inner portion of the culm
wall. The scale bar is 55µm.
contains more starch and is more susceptible to
borer damage. Evidently, the borers show a
preference for ‘starch-rich sites’ probably for a
more productive feeding.
The proportions of fibro-vascular and
parenchyma tissues in different parts of the
culms are given in the Table 1. The percentage
of the fibro-vascular and parenchyma tissues
varied widely across the culm wall. The outer
portion of the culm wall had compactly
arranged fibro-vascular bundles and lower
proportion of parenchyma. In the inner portion of
culm wall, the proportion of fibrous tissue
was lower. Consequently, the proportion of
parenchymatous tissue increased from outer to
3
inner part of the culm wall. This trend of
distribution of tissues was also observed at
different height levels of the bamboo culm.
Thus the proportion of ground parenchyma
tissue responsible for storage was invariably
greater in the inner portion, which favored
accumulation of starch in this portion (Table
1). Maximum starch content was observed in
the inner portion of the distal part of the culm.
In contrast, it was lowest in the outer part of
the basal portion of the culm.
The selective feeding behavior of the borers
as observed in the present study is an indication
of their preference for starch-rich sites. Abundant
availability of starch seems to be a prerequisite
for successful multiplication of borer population, and this turns out to be a reason for intensive damage to felled or stored culms. It has
been previously reported that borer infestation
occurs if the starch content in the material
exceeds a certain total level (Beeson, 1941).
This also implies that culms that escape borer
damage are the ones with less or no starch.
ACKNOWLEDGEMENTS
The financial support from MoEF, Govt. of
India to carry out this study is gratefully
acknowledged. We are thankful to Dr. J.K.
Sharma (Director, KFRI) for encouragement
and Prof. Walter Liese (Germany) and
Elizabeth Magel (University of Hamburg,
Germany) for their help during the study.
Table 1. Starch content and tissue proportion in outer and inner portions of the culm wall at
different height levels of B. bambos (mean value of five culms with standard deviation)
Portion
of the
culm
Base
Middle
Top
Starch content %
Parenchyma (%)
Fibro-vascular tissue
Outer
Inner
Outer
Inner
Outer
Inner
1.5 (1.0)
4.8 (3.0)
4.8 (4.6)
5.2 (2.1)
6.6 (2.7)
8.2 (8.0)
56.0 (4.0)
53.4 (7.3)
46.9 (7.4)
73.0 (8.4)
67.6 (6.3)
65.6 (3.9)
44.0 (4.0)
46.5 (7.3)
53.0 (7.4)
27.0 (8.4)
32.4 (6.3)
34.4 (3.9)
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Bamboo Science and Culture
LITERATURE CITED
M. Abd. Latif, K. C. Khoo and M. A. Nor
Azah, Carbohydrates in commercial
Malaysian bamboo, in: Bamboo in Asia
and Pacific, Proc. 4th Internat. Bamboo
Workshop, Chiangmai, Thailand, IDRC,
Ottawa, Canada and FORSPA, Bangkok,
Thailand, 227-229 (1994).
C.F.C.Beeson, The Ecology and Control of the
Forest Insects of India and Neibouring
Countries. Government of India, First
Reprint. 767 pp (1941).
T. K. Dhamodaran, George Mathew, R.
Gnanaharan and K. S. S. Nair, Relationship
between starch content and susceptibility to
insect borer in the bamboo reed Ochlandra
travancorica. Entomon 11, 215 – 218 (1986).
George Mathew and K.S.S. Nair, Factors influencing susceptibility of stored reed
(Ochlandra travancorica to infestation by
Dinoderus borers (Coleoptera : Bostrychidae), Proceedings of the 6th Kerala
Science Congress, Thiruvananthapuram,
Kerala, India, pp.78-80. (1994).
F.R. Humphreys, and J. Kelly, A method for the
determination of starch in wood. Anal.
Chemistry, Acta, 24, 66 -70 (1961).
K. V. Joseph, Preliminary studies on the
seasonal variation in starch content of
bamboos in Kerala State and its relation to
beetle borer infestation. J. Bombay Nat.
Hist. Soc. 55, 221 – 227. (1958).
Vol. 19
W. Liese, Preservation of bamboos. in: Bamboo
Research in Asia. Proceedings of the
Bamboo Workshop, Singapore, G. Lessard,
and A. Chouinard (Eds), pp.161-164(1980).
IDRC, Ottawa, Canada. (1980).
W. Liese, The Anatomy of Bamboo Culms,
INBAR Technical Report No. 18.
International Network for Bamboo and
Rattan, Beijing, China. 204pp (1998).
K.S.S. Nair, George Mathew, R.V. Varma, R.
Gnanaharan, Preliminary Investigations on
the Biology and Control of Beetles
Damaging Stored Reed. KFRI Research
Report No. 19. Kerala Forest Research
Institute, Peechi, India. 35pp (1983).
H. K. Plank and R. H. Hageman, Starch and
other carbohydrates in relation to the
powder-post beetle infestation in freshly
harvested bamboo, J. Econ. Entom. 44,
73 – 75. (1951).
P.K. Sen Sarma, Insect pests and their control
in rural housing. Indian J. Entom. 39,
284-288 (1977).
Achmad Sulthoni, Traditional preservation of
bamboo in Java, Indonesia, in: Recent
Research on Bamboo, Proceedings 3rd
International Bamboo Workshop. Hangzhou,
China, A.N. Rao, G. Dhanarajan and
C.B. Sastry (Eds), Chinese Academy of
Forestry ,Beijing and IDRC, Ottawa,
Canada, 349-357 (1987).
Bamboo Science and Culture:
The Journal of the American Bamboo Society 19(1): 5-10
© Copyright 2005 by the American Bamboo Society
A new species of Chusquea sect. Longifoliae from Ecuador
Lynn G. Clark and David A. Losure
Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, Iowa
50011-1020 U. S. A.
Chusquea robusta from Ecuador is described as new. It is illustrated and compared and contrasted
with Chusquea antioquensis (from Colombia), the species to which it is most similar. Chusquea
robusta is distinguished by its large size (culms up to 7 cm in diameter), for which it is named,
and also by its relatively small culm leaf blades, more or less horizontal junction of the culm leaf
sheath and blade, abaxially pilose foliage leaf blades with an excentric midrib, relatively large
spikelets [(11-) 12-15.5 mm long], and lengths of glumes III and IV relative to the spikelet length.
A majority of the spikelets exhibit an elongated rachilla internode between glumes I and II, a feature not observed in other species of Chusquea. Keys to the species of Chusquea sect.
Longifoliae, to which the new species belongs, are presented.
Se describe Chusquea robusta del Ecuador. Chusquea robusta se ilustra y compara con C.
antioquensis, la especie mas parecida. Chusquea robusta está nombrado por su gran tamaño (culmos hasta de 7 cm de diametro) y se le distingue ademas por sus láminas de la hoja caulinar relativamente cortas, la articulación más o menos horizontal entre la lámina y la vaina de la hoja
caulinar, láminas de las hojas de follaje abaxialmente pilosas y con un nervio central excentrico,
espiguillas relativamente largas [(11-) 12-15.5 mm de largo) y las proporciones de las glumas III
y IV comparadas con la largura de la espiguilla. Una mayoria de las espiguillas presentan el
entrenudo de la raquilla elongado entre glumas I y II, una característica no observada en otras
especies de Chusquea. Se presentan claves a las especies de Chusquea secc. Longifoliae, a la cual
pertenece C. robusta.
An estimated 30 species of Chusquea,
including representatives of both Chusquea
subg. Swallenochloa (McClure) L. G. Clark and
Chusquea subg. Chusquea, are known from
Ecuador. One of these is described in this paper
as part of work toward a treatment of the bamboo
diversity of Ecuador for the Flora of Ecuador.
The most notable feature of this new
species is its size. When the senior author first
saw this species in 1982, it appeared to be a
Guadua Kunth from a distance. Upon closer
examination, it became obvious that it was
instead a Chusquea Kunth, but one with culms
as much as 7 cm in diameter. To date, the
largest described species of Chusquea are C.
pittieri Hack. and C. antioquensis L. G. Clark
& Londoño, both of which can reach 5.5 cm in
diameter, but this new bamboo species is now
the record-holder.
Further study of herbarium specimens
of this new bamboo revealed several features
that placed it unambiguously in Chusquea
sect. Longifoliae L. G. Clark: infravaginal
branching; numerous constellate subsidiary
buds/branches; long, narrow foliage leaves;
reduced glumes I and II; and shortly
awn-tipped glumes III, IV, and lemmas (Clark
1989). Within sect. Longifoliae, however, these
Ecuadorean specimens did not match any
described species, although they were most
similar to the Colombian C. antioquensis. We
therefore describe and illustrate C. robusta
as a new species. We provide a revised key
to the species of sect. Longifoliae and a
morphological comparison of C. robusta and
its presumed sister species, C. antioquensis.
Two Mexican species, C. aperta L. G. Clark
and C. nelsonii Scribn. & J. G. Sm., were placed
in this section in Judziewicz et al. (1999), but
further study is required to establish their true
affinities, so they are not included in the keys
presented here.
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Bamboo Science and Culture
Vol. 19
TAXONOMIC TREATMENT
Key to the Species of Chusquea Sect. Longifoliae
(based on vegetative specimens)
1a. Thin, curly leafless fibrillar branchlets interspersed with the normal, leafy subsidiary
branches; internodes scabrous; foliage leaf blades with the base rounded to
rounded-truncate .....................................................................................C. scabra (Costa Rica)
1b. Fibrillar branchlets absent; internodes usually smooth, rarely scabrous just below the nodes;
foliage leaf blades with the base attenuate to rounded-attenuate.
2a. Foliage leaf blades abaxially distinctly tomentose or pilose.
3a. Foliage leaf blades abaxially tomentose, 15-27 cm long; culm leaf sheaths abaxially
glabrous; culms 6-9 m tall, 1.3-4 cm in diameter................C. tomentosa (Costa Rica)
3b. Foliage leaf blades abaxially pilose, 8-21 cm long; culm leaf sheaths abaxially
pubescent or pubescent only basally and scabrid to glabrous apically; culms
(5-) 7-12 m tall, 3-7 cm in diameter .............................................C. robusta (Ecuador)
2b. Foliage leaf blades abaxially glabrous or sometimes with sparse, scattered hairs.
4a. Foliage leaf blades 0.6-1.3 cm wide and subsidiary branches 18-30 per node; base
of culm leaf blade cordate .........................C. longifolia (Panama to Chiapas, Mexico)
4b. Foliage leaf blades 0.3-1.4 cm wide and subsidiary branches 24-80 (-100) per node;
base of culm leaf blade linear.
5a. Foliage leaf blades (0.5-) 0.7-1.4 cm wide, L:W = 11-27; internodes
terete.................................................................C. grandiflora (Colombia, Panama)
5b. Foliage leaf blades 0.3-0.9 cm wide, L:W = 18-55 (-65); internodes flattened or
shallowly sulcate above the bud/branch complement.
6a. Juncture of culm leaf sheath and blade an inverted “V”; culm
leaf blades 9.7-21 cm long, the base as wide as the sheath
apex.........................................................................C. antioquensis (Colombia)
6b. Juncture of culm leaf sheath and blade a more or less horizontal line,
sometimes slightly convex; culm leaf blades 2.6-12 cm long, the base
narrower than the sheath apex.
7a. Subsidiary branches 24-65 per node; inner ligules of foliage leaves 0.5-4
mm long.....................................................C. patens (Costa Rica, Panama)
7b. Subsidiary branches 50-80 (-100) per node; inner ligules of foliage
leaves to 1.5 mm long.
8a. Foliage leaf blades with the base attenuate, L:W = (26-)
30-48 (-54); culm leaf sheaths 4.4-6.6 times as long as
the blades...........................................................C. subtilis (Costa Rica)
8b. Foliage leaf blades with the base rounded-attenuate,
L:W = 20- 40 (-45); culm leaf sheaths 1.5-5.4 times as long as the
blades ..................................................C. foliosa (Costa Rica, Mexico)
Key to the Species of Chusquea sect. Longifoliae
(based on flowering and vegetative specimens)
1a. Synflorescences open, primary branches strongly spreading, sometimes deflexed.
2a. Glumes I and II no more than 1/10 the spikelet length; spikelets 6.9-11.2 mm long;
foliage leaf blades 0.4-0.9 cm wide, L:W = 18-48 ...........C. patens (Costa Rica, Panama)
2b. Glume I ca. 1/5 and glume II ca. 1/3 the spikelet length; spikelets 9.7-12.6 mm long; foliage
leaf blades (0.5-) 0.7-1.4 cm wide, L:W = 11-27 .......C. grandiflora (Panama, Colombia)
2005
Clark & Losure: Chusquea robusta
7
1b. Synflorescences contracted, primary branches appressed or ascending.
3a. Spikelets 10.4-20.6 mm long.
4a. Glume III 1/3-1/2 and glume IV 1/2-2/3 the spikelet length; a majority
of the spikelets with an elongated rachilla internode between
glumes I and II; foliage leaf blades abaxially pilose....................C. robusta (Ecuador)
4b. Glume III 1/2-2/3 and glume IV 4/5 to equal the spikelet length; rachilla internode
between glumes I and II always short (0.1-0.2 mm); foliage leaf blades abaxially
tomentose or glabrous (but sometimes with sparse, scattered hairs).
5a. Foliage leaf blades 0.3-0.7 (-1.1) cm wide, abaxially tomentose; fertile lemma
subulate ...........................................................................C. tomentosa (Costa Rica)
5b. Foliage leaf blades 0.6-1.3 cm wide, abaxially glabrous or sometimes with
sparse, scattered hairs; fertile lemma awned.......C. longifolia (Panama to Mexico
3b. Spikelets 7-11 (-12) mm long.
6a. Spikelets 7-9.4 mm long; thin, curly, leafless fibrillar branchlets interspersed with
the leafy subsidiary branches; internodes scabrous...................C. scabra (Costa Rica)
6b. Spikelets (7.9-) 8.4-11.8 mm long; fibrillar branchlets absent; internodes usually
smooth, rarely scabrous just below the nodes.
7a. Glume IV and fertile lemma awned; glume III 2/3-3/4 the spikelet
length....................................................................................C. subtilis (Costa Rica)
7b. Glume IV and fertile lemma subulate or awn-tipped; glume III 1/2-2/3 (-3/4) the
spikelet length.
8a. Foliage leaf blades with L:W = 20-40 (-45); culm leaf blades with the base
narrower than the sheath apex; juncture of culm leaf sheath and blade a more
or less horizontal line ......................................C. foliosa (Costa Rica, Mexico)
8b. Foliage leaf blades with L:W = 31-55 (-65); culm leaf blades with the base
as wide as the sheath apex; juncture of culm leaf sheath and blade an
inverted “V”............................................................C. antioquensis (Colombia)
Chusquea robusta L.G. Clark & Losure, sp
nov. TYPE: Ecuador. Pichincha: Saloya river
valley NE of Hacienda La Favorita, 11 Nov
1945 (fl), F.A. McClure 21431 (holotype,
QCA!; isotypes, ISC!, US!, AAU). Fig. 1.
Culmi (5-) 7-12 m alti, 3-7 cm diam.
Internodia 22-32 cm longa, glabra, sulcata.
Folia culmorum 15-37 (-40) cm longa, 1-1.5-plo
longiores quam internodam; vaginae 13.5-31
cm longae, (2.3-) 4-11 (-13)-plo longiores quam
laminam, abaxialiter pubescentes ad basim,
scabridae vel glabrae ad apicem, junctura
cujusvagina laminae linearis; cingulum ca.
3 mm latum, pubescentes; laminae 3-6 (-12)
mm longae, triangularae, persistentes, glabrae
vel scabridae, apice acuminati. Ramificatio
infravaginalis; rami subsidiarii cujusquisque
nodi 40-60, 15-45 cm longi. Folia cujusquisque
complementi 2-5; vaginae striatae, marginibus
ciliis, apicibus prolongatis; laminae 8-21 cm
longae, 0.3-0.7 cm latae, long./lat. = (16-)2138(-41), adaxialiter scabridae, abaxialiter
pilosae, costae excentricae. Synflorescentia
6-16 cm longa, paniculata, angusta. Spiculae
(11-)12-15.5 mm longae; gluma I 0.5 mm
longa, internoda rachillorum inter gluma I et II
saepe elongata 0.5-2 mm longa; gluma II 1-1.5
mm longa, purpurea, cupulata; gluma III
(4.5-) 5-7 mm longa, 1/3-1/2 longior quam
spiculam, breviter aristata; gluma IV 7-10 mm
longa, 1/2-2/3 longior quam spiculam, breviter
aristata; lemma 12-15 mm longum; palea
9-11 mm longa.
Woody Bamboo. Culms (5-) 7-12 m tall, 3-7
cm diam; internodes 22-32 cm long, glabrous,
sulcate above the bud/branch complement.
Culm leaves 15-37 (-40) cm long, persistent,
1-1.5 times as long as the internodes, juncture
of the sheath and blade horizontal to slightly
convex; sheaths 13.5-31 cm long, (2.3-) 4-11
(-13) times as long as the blade, abaxially
densely to sparsely pubescent basally and scabrid/
glabrous apically, margins ciliate; girdle ca.
3 mm wide, pubescent; inner ligule ca. 2-3
8
Bamboo Science and Culture
Figure 1. Chusquea robusta. A. Culm leaf, abaxial view. B. Foliage leaf complement. C. Foliage leaf,
ligular area. D. Synflorescence. E. Spikelet. F. Glumes I and II, closeup showing the elongated rachilla
internode. (A, C-F based on McClure 21431; B based on Young 90)
Vol. 19
2005
Clark & Losure: Chusquea robusta
mm, entire to very shortly ciliate; blades 3-6
(-12) cm long, triangular, persistent, abaxially
glabrous to scabrid, adaxially longitudinally
furrowed, pubescent, apex acuminate, often
broken off in pressed specimens. Nodes with
one triangular central bud subtended by
numerous subsidiary buds in several rows in a
crescent arrangement; nodal line horizontal,
dipping below the bud/branch complement;
supranodal ridge pronounced, 4-8 mm above
the nodal line. Branching infravaginal; leafy
subsidiary branches 40-60 per node, 15-45 cm
long, not re-branching. Foliage leaves 2-6 per
complement; sheaths striate, margins ciliate,
apex prolonged and bearing villous hairs; outer
ligule ca. 0.5 mm, glabrous, rounded; inner
ligule ca. 0.7 mm, brown-purplish, pubescent;
pseudopetiole 1-2 mm long; blades 8-21 cm
long , 0.3-0.7 cm wide, L:W = (16-) 21-38
(-41), linear-lanceolate, adaxially retorsely
scabrid, abaxially pilose, midrib clearly offset
from leaf center, prominent abaxially, margins
serrulate, + cartilaginous, base attenuate, apex
acuminate to shortly aristate. Synflorescences
6-16 cm long, narrow, paniculate, subtended by
a pale bract 1.5-5mm long, or arising from the
foliage leaf sheaths; rachis angular, twisted,
scabrid; pedicels 2-10 (-15) mm long, angled.
Spikelets (11-) 12-15.5 mm long; glume I
reduced to a 0.5 mm long brown-purplish bract,
60-70% of spikelets with a rachilla internode
0.5-2 mm long between glumes I and II, the
internode 0.1-0.2 mm long in the remainder;
glume II 1-1.5 mm long, brown-purple,
9
scabrous, cup-shaped; glumes III and IV
navicular, awn-tipped, abaxially scabrid,
sparsely ciliate along the apical margins, 7-9
nerved; glume III (4.5-) 5-7 mm long, 1/3-1/2
the spikelet length; glume IV 7-10 mm long,
ca. 1/2-2/3 the spikelet length; lemma 12-15
mm long, awn-tipped, 7-9 nerved, abaxially
scabrid; palea 9-11 mm long, 2-keeled, faintly
7-9 nerved. Flowers not seen. Fruit not seen.
Chusquea robusta is named for its robust
culms and general aspect. The elongated rachilla
internode found between glumes I and II in
60-70% of the spikelets is a highly unusual
character in Chusquea. The two flowering
collections in which this feature appears are
almost certainly from the same population;
given that it is not uniformly present in the
spikelets of this population, additional flowering
material from other populations is needed to
confirm whether this is characteristic of
C. robusta. For the present, this character,
as well as spikelet size and the ratio of glume
III and IV length to spikelet length, clearly
differentiate flowering specimens of C. robusta
from the closely allied species C. antioquensis,
which is known from the same mountain range
as C. robusta but from further north in
Colombia. Vegetatively the two are quite similar, but can be distinguished by the horizontal
junction of the culm leaf sheath and blade, as
well as the excentric midrib of the foliage leaf
and the abaxially pilose foliage leaf blades, in
C. robusta (Table 1).
Table 1. Morphological comparison of C. robusta and C. antioquensis.
Character
spikelet length
0.5-2 mm long internode between
glumes I and II
ratio of glume III length to total
spikelet length
ratio of glume IV length to total spikelet length
juncture of culm leaf sheath and blade
culm leaf length
foliage leaf midrib
foliage leaf blade pubescence
C. robusta
(11—)12—15.5 mm
present in 60—70% of
spikelets
1/3—1/2
C. antioquensis
(7.9—) 8.6—10 (—11) mm
absent
1/2—2/3
linear
15—37 cm
excentric
pilose
ca. 4/5
distinctly notched or v’d
38—65 cm
centric
glabrous
1/2—2/3
10
Bamboo Science and Culture
This species is known from four collections
in the mountainous region of northern
Ecuador. The two collections for which the
location is known precisely were both from
disturbed cloud forest habitats at elevations
between 2000 and 2100 m.
Chusquea robusta was first collected in
flower in 1945. Another flowering collection
was made in 1982. Since the two collections
appear to be from the same population, this
could indicate a 37-year flowering cycle, which
would be typical for species of Chusquea
(Judziewicz et al. 1999). However, further
observation of the species will be necessary to
confirm this.
One vegetative collection from northern
Ecuador, S.M. Young 90, was examined
and used in defining the species concept of
C. robusta. Other vegetative collections from
southern Ecuador examined, P. Lozano 927
(ISC, LOJA) and L.G. Clark, R. Townsend &
P. Lozano 1626 (ISC, LOJA, QCA) clearly
belonged to Chusquea sect. Longifoliae, but
could not be determined as either C. robusta or
C. antioquensis. Although these specimens, from
the province of Zamora-Chinchipe, closely
resemble both C. robusta and C. antioquensis,
they do not have sulcate internodes and their
foliage leaves are wider than those observed in
either named species. Until flowering material
or collections from other southern populations
are available, we refer these specimens to an
entity called C. aff. robusta.
Additional
specimens
examined.
ECUADOR. Pichincha: Old Quito-Sto.
Domingo road, 54-55 km from Quito, 4.9 km
west of Chiriboga, western slope, 2100 m, 27
Aug 1982 (fl), L. Clark, C. Calderon & E.
Asanza 312 (ISC, QCA, US); old road from
Quito to Santo Domingo, about 55 km from
Quito, W of Chiriboga, 1850 m, 7 Jun 1992, L.
Clark 1132 (AAU, ISC, MO, QCA, US). Napo:
36 km south of Baeza on the road to Tena, 2070
m, 28 Mar 1980, S. M. Young 90 (QCA, US ).
Vol. 19
ACKNOWLEDGMENTS
Travel to Ecuador by Clark was supported
by a Foreign Travel Grant from Iowa State
University. Fieldwork was conducted under the
auspices of the Pontifícia Universidad Católica
del Ecuador (Herbario QCA) and a grant to
Simon Laegaard from the Danish National
Science Foundation. Clark thanks Simon
Laegaard (AAU), Benjamin Øllgaard (AAU)
and Pablo Lozano (LOJA) for valuable assistance with the fieldwork and the Gonzalo
Alcivar family for their hospitality in Ecuador.
Anna Gardner assisted with final preparation
of the line drawing.
LITERATURE CITED
Clark, L.G. 1989. Systematics of Chusquea
Section Swallenochloa, Section Verticillatae,
Section Serpentes, and Section Longifoliae
(Poaceae-Bambusoideae).
Systematic
Botany Monographs 27: 1-127.
Judziewicz, E. J., L. G. Clark, X. Londoño and
M. J. Stern. 1999. American Bamboos.
Washington, D. C.: Smithsonian Institution
Press.
Bamboo Science and Culture:
The Journal of the American Bamboo Society 19(1): 11-15
© Copyright 2005 by the American Bamboo Society
Aulonemia dinirensis (Poaceae: Bambusoideae: Bambuseae)
a new dwarf Venezuelan species from the
easternmost Andean páramos
Emmet J. Judziewicz
Department of Biology, University of Wisconsin-Stevens Point,
Stevens Point, WI 54481, U.S.A
emmet.judziewicz@uwsp.edu
and
Ricarda Riina
Department of Botany, University of Wisconsin,
430 Lincoln Drive, Madison, Wisconsin 53706, U.S.A.
rgriinaoliva@wisc.edu
The new species Aulonemia dinirensis Judz. & Riina is described from the Páramo de Cendé, the
easternmost páramo of the Andean Cordillera, in the state of Lara, Venezuela. A dwarf species
0.4-0.8 m tall known only from elevations of 2700 m in subpáramo vegetation on sandstone, its
most closely related congener may be A. trianae, which is a much more robust plant with smaller
spikelets.
Una nueva especie, Aulonemia dinirensis Judz. & Riina, es descrita del páramo de Cendé, uno de
los páramos más orientales de la Cordillera de los Andes, en el Estado de Lara, Venezuela. Se trata
de un bambú enano 0.4-0.8 m alto, solo conocido de elevaciones de 2700 m en vegetación de subpáramo sobre areniscas. La especie[s] está más relacionada con su congénere A. trianae, la cual
es mucho más robusta con espiguillas más pequeñas.
A floristic inventory of the páramos and
subpáramos of the Parque Nacional Dinira
(Lara, Trujillo, and Portuguesa states,
Venezuela) by the second author resulted in the
collection of several botanical novelties,
including a new dwarf bamboo species in the
genus Aulonemia (Poaceae: Bambusoideae:
Bambuseae: Arthrostyliidinae):
Aulonemia dinirensis Judz. & Riina sp nov.
(Fig. 1). TYPE: VENEZUELA. Lara: Parque
Nacional Dinira, vertiente hacia El Tocuyo,
sector “La Lajita”, camino hacia “La Lajita”,
9°32'47"N, 70°05'38"W, 2700 m, vegetación
herbácea con arbustos dispersos o agrupados
en pequeñas islas, bambusillo de 1 m alto,
espiguillas verde-grisáceas, frecuente en
ladera, 15 Aug 1999, R. Riina, R. Duno, R.
Ghinaglia & R. Gonto 713 (HOLOTYPE:
VEN; ISOTYPES: ISC!, MO!, SI!).
Culmi 3-4 mm diametro, 0.4-0.8 m alti,
cespitosi, erecti. Vagina foliorum glabrescens,
striata, nonauriculata; fimbriae nulliae; lamina
foliorum 7-10 cm longa, 1-2.3 cm lata, reflexa,
puberulenta. Inflorescentia paniculatam
20-25 cm longa. Spiculae 25-35 mm longae,
puberulentes, 8-10 flosculos fertiles continentes;
glumae 2, acutae; gluma I 2-2.5 mm longa,
gluma II 5.5-7 mm longa; lemma 8-10 mm
longa, apiculata.
Cespitose woody bamboo. Culms glabrous,
smooth, non-maculate, hollow (the lumen
about one-third the diameter of the culm),
0.4-0.8 m tall and 3-4 mm in diameter; buds or
branches one per node; branches several to
many, erect. Culm leaves not seen, perhaps not
differentiated from foliage leaves. Foliage
leaves 4-5 per complement; sheaths glabrous,
striate throughout, stramineous (at least when
11
12
Bamboo Science and Culture
Figure 1. Aulonemia dinirensis. A. Habit. B. Spikelet, profile view. C. Lemma, dorsal view. I
llustration by E. Judziewicz. (Based on Riina et al. 713, MO).
Vol. 19
2005
Judziewicz & Riina: Aulonemia dinirensis
dried), not keeled, non-maculate, lacking auricles; fimbriae not evident on sheath margins or
summit (but, if present, could have fallen from
the available mature collections); outer ligules
0.2-0.3 mm long, indurate, rim-like; inner
ligules 0.4-0.6 mm long, membranous;
pseudopetioles 1-2 mm long, pale, glabrous;
blades lanceolate, strongly reflexed, deciduous,
7-10 x 1-2.3 cm, acuminate at the apex,
rounded at the base, finely puberulent on both
surfaces. Inflorescences 20-25 x 8-10 cm, open
panicles with loosely erect, glabrous, smooth,
capillary branches. Spikelets 25-35 mm long,
1.5-2.7 mm wide, linear, grayish-stramineous
(at least when dried), finely puberulent
throughout, 8-10-flowered; lower glume 2-2.5
mm long, ovate-lanceolate, acute, 1-3-nerved;
upper glume 5.5-7 mm long, lanceolate, acute,
3-5-nerved; lemmas 8-10 mm long, lanceolate,
apiculate, 7-9-nerved; paleas 6.5-7.5 mm long,
2-nerved, obtuse at the apex; stamens with
anthers ca. 3 mm long; fruits not seen.
Aulonemia dinirensis grows on sandstone
substrates in periodically burnt subpáramos at
13
elevations of 2700 meters on the northeastern
slopes of the Páramo de Cendé, in the Andes of
northwestern Venezuela (Fig. 2). This is the
easternmost páramo in the Andean cordillera
reaching its maximum altitude at the summit of
the Páramo de Cendé (ca. 3350 m). The species
is not common and is apparently restricted to a
small area of the Parque Nacional Dinira in the
state of Lara. Associates include the endemic
sundew Drosera cendeensis Tamayo & Croizat
(Droseraceae); the endemic asteraceous species
Ruilopezia emmanuelis Cuatrec., Ruilopezia
floccosa (Standl.) Cuatrec., R. jabonensis
(Cuatrec.) Cuatrec., R. vergarae Cuatrec. &
López and Monticalia rigidifolia (V.M.
Badillo) C. Jeffrey; various grasses (Festuca
sp., Agrostis humboldtiana Steud., Chusquea
angustifolia (Soderstr. & C. Calderón) L.G.
Clark, and Danthonia secundiflora J. Presl.);
the bromeliad Puya aristeguietae L.B. Sm.;
the fern Blechnum obtusum R.C. Moran
& A.R. Sm. (Moran & Smith 2005); and
Dendrophthora meridana Kuijt (Viscaceae).
Figure 2. Subpáramo habitat of Aulonemia dinirensis, el. 2700 m, Parque Nacional Dinira, state of Lara,
Venezuela, 15 Aug. 1999. Photograph by R. Riina.
14
Bamboo Science and Culture
The specific epithet refers to the name of
the park (Parque Nacional Dinira). The word
“dinira”, of arawak-caquetio origin, was used
in the description of the city of El Tocuyo (Lara
state) in 1578, published by Arellano Moreno
(1964). The report (translated) indicates that “El
Tocuyo was founded between two mountain
ranges, Dintas to the east and Dinira to the
west”. The meaning of “dini” is breast and
refers to conical shape of some mountains, and
“ira” means liquid, so the meaning of “dinira”
for the caquetio amerindians was probably
“mountain where the river (the Tocuyo river)
comes from” (B. Manara, pers. com.).
Aulonemia is a genus of 45-50 species of
bamboos (Judziewicz et al. 1999, 2000), with
many undescribed narrowly endemic species in
Andean South America. The new species is
clearly referable to Aulonemia based on its
branching habit (one branch per node),
reflexed leaf blades, paniculate inflorescence,
and spikelet structure.
Aulonemia dinirensis is a dwarf species
probably most closely related to A. trianae
(Munro) McClure (Table 1; Clark & Londoño
1990, Clark et al. 1997), an Andean species
found in northern Colombia and the adjacent
state of Táchira, Venezuela. Both taxa share
efimbriate or sparsely fimbriate leaf sheath
summits; an absence of sheath auricles; and
spikelets with awnless, apiculate lemmas.
However, A. dinirensis is a shorter, more slender
species than A. trianae and differs in its longer,
more floriferous spikelets (Table 1).
A collection of an Aulonemia species by
the second author (Parque Nacional Dinira,
ladera del Páramo de Jabón, vertiente hacia El
Tocuyo, sector “Los Charquitos”, 9°34'26"N,
Vol. 19
70°06'03"W, 2800-2900 m, 15 Aug 1999,
R. Riina et al. 680, VEN) made just 3 km by
air from the type locality of A. dinirensis is
tentatively referred to A. trianae. It differs from
A. dinirensis in its more numerous (7 or more),
crowded leaf complements; prominent 2 cm
long, dark, erect, leaf sheath summit fimbriae;
smaller panicles with just a few stout branches;
and shorter (ca. 15-20 mm long) spikelets with
fewer (5-6) florets.
Two other dwarf (1 m tall or less) species
of Aulonemia occur in the northern Andes:
A. bogotensis L.G. Clark, Londoño & M.
Kobayashi (Clark et al. 1997) in central
Colombia and A. pumila L.G. Clark &
Londoño (1990) in southwestern Colombia.
Aulonemia dinirensis differs from A. bogotensis
in its much larger leaf blades (7-10 x 1-2.3 cm
vs. 2-4.2 x 0.3-0.5 cm) and longer (25-35 vs.
9.7-13 mm long) spikelets with more florets
(8-10 vs. 3-5). Aulonemia dinirensis differs
from A. pumila in its larger spikelets (25-35 vs.
8.4-12.6 mm long) with awnless, apiculate (not
subulate-aristate to aristate) spikelet bracts, and
more (8-10 vs. 2-3(-4)) florets per spikelet.
Aulonemia dinirensis does not appear to be
conspecific with any congeners occurring in
the Guayana Highlands (Judziewicz 2004,
2005); in this region, A. dinirensis would key
most closely to the dwarf species “Aulonemia
sp. C” from Cerro Marahuaka, Venezuela – but
the latter undescribed species differs in its
significantly smaller leaf blades (4 x 0.7 cm)
and purplish rather than grayish-stramineous
spikelets. If the leaf blades of Aulonemia
dinirensis are truly efimbriate (it is difficult to
be certain with the late-fruiting-stage collections
available; fimbriae are sometimes deciduous in
Table 1. Comparison of Aulonemia dinirensis Judz. & Riina with A. trianae (Munro) Mc Clure.
Character
Distribution
Elevation (m)
Plant height (m)
Culm diameter (mm)
Leaf blade length (cm)
Spikelet length (mm)
Florets per spikelet
A. dinirensis
Venezuela (Lara)
2700
0.4-0.8
3-4
7-10
25-35
8-10
A. trianae
Colombia (northern half), Venezuela (Táchira)
2500-3150
1-2.5(-6)
5-10
6-15
10-18
5-6(-8)
2005
Judziewicz & Riina: Aulonemia dinirensis
the genus), then the species might appear to
have some affinities with the Bolivian endemic
A. tremula Renvoize (Renvoize 1998). However,
that species has a scandent, pendant habit with
culms up to 10 m long and smaller (10-22 mm
long), fewer-flowered (4-5) spikelets than
A. dinirensis.
ACKNOWLEDGMENTS
We thank Gerrit Davidse (MO) for the loan
of the specimens, Lynn Clark for encouraging
us to publish this new species, Bruno Manara
for his contribution to the etymology of the
species name, Ismael Capote and Carlos Reyes
from the Herbario Nacional de Venezuela, and
the Fauna & Flora Preservation Society and
Fundación Instituto Botánico de Venezuela for
helping to fund the second author’s fieldwork.
LITERATURE CITED
Arellano Moreno, A. 1964. Relaciones geográficas de Venezuela, Biblioteca de la
Academia Nacional de la Historia, no. 70.
Caracas.
Clark, L.G. and X. Londoño. 1990. Three new
Andean species of Aulonemia (Poaceae:
Bambusoideae). Annals of the Missouri
Botanical Garden 77: 353-358.
15
Clark, L.G., X. Londoño and M. Kobayashi.
1997. Aulonemia bogotensis (Poaceae:
Bambusoideae), a new species from the
Cordillera Oriental of Colombia. Brittonia
49: 503-507.
Judziewicz, E.J. 2004. Aulonemia. Pp. 40-45 in
Steyermark, J.A., P.E. Berry, K.
Yatskievych, and B.K. Holst, eds.: Flora of
the Venezuelan Guayana, Vol. 8: PoaceaeRubiaceae. Missouri Botanical Garden
Press, St. Louis. xiii + 874 pp.
Judziewicz, E.J. . 2005. Aulonemia nitida
(Poaceae: Bambusoideae: Bambuseae), a
new species from Guyana. Sida 21: 12631267.
Judziewicz, E.J. , L.G. Clark, X. Londoño, and
M.J. Stern. 1999. American Bamboos.
Smithsonian Institution Press, Washington,
DC. vii + 392 pp.
Judziewicz, E.J. , R.J. Soreng, G. Davidse, P.
Peterson, T.S. Filgueiras, and F.O. Zuloaga.
2000. Catalogue of New World Grasses
(Poaceae): I. Subfamilies Anomochlooideae,
Bambusoideae, Ehrhartoideae, and Pharoideae.
Contributions from the United States
National Herbarium 39: 1-128.
Moran, R.C. and A.R. Smith. 2005. Blechnum
obtusum (Blechnaceae), a new species from
western Venezuela. Brittonia 57: 237-239.
Renvoize, S.A. 1998. Gramíneas de Bolivia,
Royal Botanic Gardens, Kew. xxx + 644 pp.
Bamboo Science and Culture:
The Journal of the American Bamboo Society 19(1): 16-22
© Copyright 2005 by the American Bamboo Society
Developmental anatomy of the fiber in
Phyllostachys edulis culm
Gan Xiaohong1, Ding Yulong2 *
1
2
College of life science, China West Normal University, 637002, Nanchong, P.R. China
Bamboo Research Institute, Nanjing Forestry University, 210037, Nanjing, P.R. China
With several methods of microscopy, the differentiation and development of fibers in the middle
third of Phyllostachys edulis culm walls were systematically studied. The development of fibers
could be divided into three stages: the formation of fiber initials, primary wall and secondary
wall. Fibers originated from the same procambium as the vascular bundle elements like vessels
and sieve tubes, but their differentiation is later. Fibers centrifugally underwent differentiation and
development outwards from a vascular bundle. During primary wall formation, most fibers were
bi-nucleate or multi-nucleate contributing to their elongation, which might be related to amitosis.
During secondary wall formation, fiber wall underwent dominant thickening during the first 4
years, and then the degree of wall thickening decreased gradually. With the thickening of secondary
wall, fiber nucleus persisted for many years in the culms investigated. The plasmodesmata and
transfer vesicles were also persistent in the pits between the fibers and their adjacent cells. The
results demonstrated that the fiber in the middle third of Phyllostachys edulis culm walls is a kind
of long-living cell. The persistence of fiber nucleus and plasmodesmata and transfer vesicles is
closely related to the thickening of secondary wall with aging.
Phyllostachys edulis (Carr.) H. De Lehaie
has the largest distribution area and the highest
economical value in China. Because of the
high fiber content of 38% (Grosser & Liese,
1974), it is widely used for making furniture,
construction, pulp and other industries in
China. The variation in the structure and
properties of fibers with aging has a decisive
impact on the property of bamboo culms, and
in turn, dramatically affect culm utilization.
The morphology, chemical components and
tissue ratio of fibers in Phyllostachys edulis
culm were studied by Parameswarn and Liese
(1976) and Xiong et al. (1980b). Some
anatomical changes during the development
of fibers were also reported (Xiong et al.,
1980a; Liese and Weiner, 1997; Murphy and
Alvin, 1997; He et al., 2000). Little is known
about systematic anatomical studies of fiber
development so far.
In this paper, further studies of the origin
and developmental anatomy, as well as the
long-living character of fiber in Phyllostachys
edulis culms were reported in detail. Due to the
difference of the position of the vascular bundles and the location of the fibers within, the
developmental pattern among fibers across a
culm wall is different (Liese, 1998). Only the
fibers in the middle third of the culm wall were
investigated in this work.
MATERIALS AND METHODS
Materials
Young shoots and culms of 1 to 16 year
old Phyllostachys edulis were harvested in
April 2001 at the Bamboo Garden and the
experimental forestry farm of Nanjing Forestry
University. Young shoots with heights of 60
cm, 80 cm, 120 cm and 700 cm were collected,
and samples about one-cm3 from the middle
third of the culm wall in the middle part of
every internode of the young shoots taken. For
1 to 16-year-old culms blocks about one-cm3
*Corresponding author. .
Email: ylding@vip.163.com
16
2005
Xiaohong & Yulong: Fiber anatomy in Phyllostachys
M iddle third
17
Outer third
Inner third
M iddle p art
M iddle part of the culm (in
general, it lies in the first
internode below t he first
branching n ode)
One internode
Figure. 1 Schematic figure of material collection
were sampled only from the middle third of
culm wall in the middle part of internodes in
the middle part of the culms. (Fig. 1)
Methods
Preparation for light microscope
The blocks from young shoots were
immediately fixed in FAA (formalin, acetic
acid and ethyl alcohol) with 50 % alcohol, and
the blocks from 1 to 16-year-old culms in FAA
with 70% alcohol. Transverse and longitudinal
sections of young shoots were made with a
routine paraffin method and stained with
safranin-fast green. For the 1 to 16 years old
culms, sections were made with GMA (glycol
methacrylate) or PEG (polyethylenglycol) 2000
method, and stained with safranin-alstrablue,
crystal violet, or acridin orange. All sections were
examined and photographed with a biological
optical microscope (OLYMPUS, Japan).
Preparation for scanning electron microscope
Blocks of approximately one-cm3 from 1
to 16-year-old culms were treated with FAA,
and cooked at 1.2 bars in an autoclave for 4
hours. Later the surface of the transverse samples was cleaned with a sharp blade. Following
dehydration with serial gradient alcohol from
50 to 100%, the samples were dried with the
critical point method. All samples were examined and photographed with a JSM-6300 scanning electron microscope.
Preparation for transmission electron microscope
Blocks of approximately one-mm3 from
1 to 16-year-old culms were fixed in 2.5%
glutaraldehyde (in 0.025 mol/l phosphate
buffer, pH7.0) for 4 hours. After washing with
the same buffer, the samples were post-fixed in
1% OsO4 (also in the same buffer) for 3 hours.
Followed by a further washing with the buffer,
the specimens were dehydrated in a graded
ethanol series and embeded in Spurr’s resin.
After cutting with a diamond knife on a
LKB-V ultramicrotome, ultrathin sections
were stained with saturated aqueous uranyl
acetate for 5 min, followed by 5 min in lead
citrate. Finally all sections were examined
and photographed with a H-600 transmission
electron microscope (TEM).
RESULTS
The successive development of bamboo
fibers could be divided into three stages: formation of fiber initials, primary wall and secondary wall.
Fiber initials formation
The terminal meristem in longitudinal
sections consists of tunica and corpus from where
the primary meristem was derived (Fig. 2, a).
With further development and differentiation,
some cells elongated in axial direction forming
procambium(Fig.2, b). These cells were much
18
Bamboo Science and Culture
Vol. 19
Figure .2. a: the structure of shoot apex, showing tunica, corpus, LS; b: the procambium with diffuse
chromatin, LS; c: the early procambium strands with four cells (arrowheads), TS; d: procambium strands
with a cluster of cells (arrowheads), TS; e: the formation of prophloem sieve tube (arrowheads),
TS; f: the formation of protoxylem vessel (arrowheads), TS; g: the formation of fiber initials (arrowheads),
TS; h: the fibers during co-development with vascular bundle, showing bi-nuclei or multi-nuclei
phenomenon(arrowheads), LS; i: the fibers during intrusive growth, showing only a nucleus, LS.
(Co, corpus; F, fiber; Pc, procambium; Tu, tunica; V, vessel). – Scale bar for a, c, d, e- i = 10µm, for b =100µm
2005
Xiaohong & Yulong: Fiber anatomy in Phyllostachys
longer than the neighboring ones and appeared
deeply stained with safranin.
Transversely, the vascular bundles were to
differentiate from procambium cells with the
culm elongation. The procambium strands had
only four cells formed early (Fig.2, c), and then
divided into a cluster (Fig.2, d). With further
development, protophloem sieve tubes from
the outer layers of procambium appeared
(Fig.2, e). Afterwards, the first protoxylem
vessel, the annular vessel, developed from the
inner layers of procambium (Fig.2, f). With
internodal elongation of the culm, metaxylem
vessels from the lateral cells of procambium and
vascular bundle parenchyma from the middle
ones gradually differentiated. Nevertheless, a
layer of procambium cells to form the culm
fibers was still around the vascular bundle
elements as fiber initials (Fig. 2, g).
Primary wall formation
During primary wall formation, a fiber
successively exhibits co-growth with vascular
elements and intrusive growth.
At this stage, fiber maintained its cylinder
form and partly elongated coupled with radial
extension and elongation of vessel elements.
Bi-nuclei or multinuclei cells were observed
with a dense protoplast and smaller vacuole
(Fig.2, h). Following, fibers with bi-nuclei or
multinuclei were gradually vacuolated and in
parallel way arranged.
culm, TS; f : a one-year-old inflorescence
fiber, showing the agglutinated nucleus, LS; g:
a one-year-old inflorescence fiber, showing the
normal nucleus(arrow), LS; h: the fiber in the
eight-year-old culm, showing the persistence
of nucleus (arrow), TS; i: the plasmdesmata
and transfer vesicles (arrow) between fiber and
its adjacent cells in four-year-old culm, TS.
(F, fiber; FC, fiber cap; MV, metaxylem vessel;
N, nucleus; Pa, parenchyma; Pd, plasmodesmata;
Ph, phloem; SW, secondary wall). – Scale bar
for a,f,g = 10µm, for b =100µm, for c- e =5µm,
for h,i = 1µm
When the co-growth of fiber terminated,
fibers longitudinally arranged in stagger way
were fusiform, indicating the beginning of
intrusive growth. At this stage, a central large
19
vacuole and only a single nucleus with distinct
nucleolus were seen (Fig. 2, i). When fiber walls
were stained red by safranin due to lignification,
primary wall formation came to an end.
During primary wall formation, fiber
underwent centrifugally differentiaton and
development transversely. Earlier only a
layer initials surrounded the vascular bundle.
Later they radially divided into two daughter
cells. Thereafter, the outer ones maintained its
meristematic character, while the inner ones
increasingly vacuolated and elongated until the
end of fiber primary wall formation (Fig.3, a).
Similarly, fiber cap formed increasingly (Fig.3, b).
Secondary wall formation
During secondary wall formation, fiber
walls lignified and thickened with aging.
During the first 4 years, a dominant thickening
of fiber wall was observed (Fig.3, c-e). Later,
the degree of thickening decreased gradually.
Figure.3. a: the fiber cap during development
(arrow), TS; b: the fiber cap finishing development,
TS; c: the fiber wall in the culm of one year old,
TS; d: the fiber wall in the two-year-old culm, e;
15: the fiber wall in the four-year-old
20
Bamboo Science and Culture
Fiber wall is characterized by a regular alternation
of broad and narrow lamellae during thickening,
as also observed by Parameswaran & Liese
(1976, 1980).
With the formation of secondary wall,
fiber nuclei underwent a series of changes.
Almost all fiber nuclei with distinct nucleoli in
one-year-old culms were fusiform and unevenly
stained (Fig.3, g). In contrast, the nuclei in the
fibers adjacent to the vascular bundle were
evenly stained with crystal violet, due to the
agglutination of chromatin ( Fig.3, f ). With the
continuous thickening of fiber wall, the nuclei
became strip-formed and evenly stained. , They
were persistent for eight years (Fig.3, h).
Ultrastructural investigations showed the
plasmodesmata persistent in the border pit
pairs between fibers and their adjacent cells
during secondary wall formation. A great number of transfer vesicles were also seen in the pit
channels (Fig.3, i).
DISCUSSION
The origin of fibers
The fibers in the culm of Phyllostachys
edulis around a vascular bundle form a fiber
cap or fiber sheath, but their origin is still
controversial. Fahn (1982) considered that the
inner cells of the fiber cap originated from
procambium, but the outer ones from ground
meristem. According to Xiong et al. (1980b),
procambium cells first differentiated into
parenchyma just around the vascular elements,
and then differentiated into fiber cells, so
that fibers originate from parenchyma around
vascular bundle. In this research, fiber cells
differentiated later than vascular tissue. With
the formation of vascular bundle elements, the
cells just around can become fiber initials.
Subsequently, they underwent differentiation
and development centrifugally outwards from
vascular bundle resulting in the formation of
fiber caps. Whereby the development degree of
fiber in a fiber cap decreased outwards, and the
wall thickness of inner cell was thinner than at
the outer part. Accordingly, fiber cells originate
from the same procambium strand as vascular
bundle elements.
Vol. 19
The bi-nucleate or multi-nucleate phenomenon
of fibers during primary wall formation
During primary wall formation, fiber cells
were bi-nucleate or multi-nucleate, while the
phenomenon disappeared with secondary wall
formation. Bi-nuclei or multi-nuclei were first
reported by Esau (1943) in the development of
the primary phloem fibers of Nicotiana and
Linum, and also by Xi and Bao (1997) in the
fusiform initial cell and ray initial cell of
Camptothea acuminate cambium. Hu and
Zhu (2000) thought that bi-nucleate or multinucleate occurrence is related to amitosis,
which enables faster gene amplification in a
cell. The bi-nuclei or multi-nuclei can provide
more nutrients for the development of the
pollen strengthening the metabolism. Xiong et
al. (1980a) discovered the phenomenon of
amitosis in internodes elongation, but did not
discuss the relationship between amitosis and
the bi-nucleate or multi-nucleate phenomenon.
During the growth of Phyllostachys edulis
culm, internodal elongation attributed to
amitosis leading to the occurence of bi-nuclei
or multinuclei. Fiber primary wall formation
and elongation is consistent with the internodal
elongation of culms. We presume that the
bi-nuclei or multi-nuclei of a fiber can strengthen
its metabolism to meet the demands of fiber
elongation. When fiber elongation came to an
end, amitosis was unnecessary as shown in the
disappearance of bi-nuclei or multinuclei. How
the bi-nuclei or multi-nuclei phenomenon of
fiber disappeared was not investigated in this
paper. The mechanism of nucleus change in
bamboo fiber has to be studied further during
fiber development.
The variation of fiber wall
The variation of fiber wall was largely
reported to date. Fujii (1985), reported that
larger fibers of Pleioblastus chino continued
thickening late into the second year. Alvin and
Murphy (1988) found that fiber walls in
Sinobambusa tootsik were to go on thickening
into the third year. Murphy and Alvin (1992)
discovered that fiber walls in the 3-5 years old
culms of Phyllostachys viridi-glaucescens had
a polylamellate structure. Liese and Weiner
(1996), in a valuable view of ageing in bamboo
2005
Xiaohong & Yulong: Fiber anatomy in Phyllostachys
culms, showed that the culm of Phyllostachys
viridi-glaucesens underwent aging processes
involving fiber wall thickening. While in their
research (Liese & Weiner 1997), fiber wall
thickness of the same bamboo was observed
to increase during the maturation period, but
also up to the investigated 12 years. Most
recently, Lybeer and Koch (2005) investigated
the lignification during ageing of bamboo
culm. However, the variation law of fiber wall
with aging was unclear as yet.
The result in our investigation just
indicated the variation law of fiber walls
during development: the fiber wall underwent
a fast thickening in the first 4 years, and then the
degree of thickening decreased. The variation
of fiber wall is consistent with the growth of
bamboo culms (Zhou, 1998): in the first 4 years,
the growth of bamboo culms was dominant,
and then the degree of culm growth gradually
decreased with aging. That means the fibers
of Phyllostachys edulis culms underwent
co-development with the culm growth. Only
the variation of fiber wall was qualitatively
analyzed in our research. Further studies about
quantitative investigation of wall variation
and physiological analysis during fiber
development will help us to reveal the variation
mechanism of fiber wall.
The persistence of the fiber nucleus and
plasmodesmata
In this study, almost all fibers in the middle
third of a one-year-old culm wall of Phyllostachys
edulis still had nuclei with a distinct nucleolus,
and then their nucleoli gradually disappeared,
while the nuclei of fibers persisted for up
to eight years. In addition, the persistence of
plasmodesmata and transfer vesicles could
guarantee intercellular linkage between the fibers
and their adjacent cells. The results showed that
the fibers in the middle third of Phyllostachys
edulis culm walls kept their living protoplast
for a long time after lignification and wall
thickening. Generally, a mature fiber is considered a dead cell without protoplast, whereby
bamboo fibers can maintain their protoplast for
many years (Liese, 1998). In addition, it was
reported that the xylem fibers of Tamarix
aphylla kept alive for 20 years (Fahn, 1982).
21
Due to secondary growth of woody dicotyledons,
new secondary xylem will form and become
sapwood instead of old secondary xylem.
Fibers with living protoplast are usually in
sapwood, and have functions in sustaining
and storing (Gu et al., 1993), while those in
heartwood, losing their protoplast, become
dead cells. Different from other woody plants,
bamboo in its absence of secondary growth
depends mainly on its primary vascular system
during the whole life of a culm. Once differentiating from procambium, bamboo fibers as an
important component of primary vascular
system will remain alive for many years. The
persistence of nuclei and intercellular linkage
attributes to continuous thickening of fiber
secondary wall. This obviously shows that
the fiber studied in this research is a special
long-living cell, quite different from fibers in
dicotyledons.
ACKNOWLEDGEMENTS
We are grateful to Prof. Dr. Walter Liese for
valuable advices and Mr. Richard Morton for
checking the English text of this manuscript.
This work supported by the National Natural
Science Fund of China (30271064)
LITERATURE CITED
Alvin, K.L. & Murphy, R.J. 1988. Variation in
fibre and parenchyma wall thickness in
culms of the bamboo Sinobambusa tootsik.
IAWA Bulletin, 9(4):353-361
Bailey I. W. 1953. Evolution of the tracheary
tissue of land plants. Am. J. Bot., 40: 4-8.
Esau, K. 1943. Vascular differentiation in the
vegetative shoot of Linum _. The origin of
the bast fibres. Am. J. Bot., 30:571-86
Fahn A. Plant Anatomy, the third edition,
Pergamon Press, 1982.
Fujii, T. 1985. Cell wall structure of the culm of
Azumanezasa (Pleioblastus chino Max.).
Mokuzai Gakkaishi, 31:865-872
Gu Angeng & Lu Jinmei & Wang Lijun. The
evolvement morphology of vascular plants.
Jilin Scientific and Technologic Press,
Changchun, China, 1993, pp135.
22
Bamboo Science and Culture
Grosser, D. & Liese, W. 1974. Verteilung der
Leitbündel und Zellarten in Sproßachsen
verschiedener Bambusarten. Holz RohWerkstoff, ,32: 473-482.
He Xinqiang, Wang Youqun, Hu Yuxi & Lin
Jinxing. 2000. Ultrastructural study of
secondary wall formation in the stem fibre
of Phyllostachys pubescens. Acta Bot.
Sinica, 42(10): 1009-1013
Hu Shiyi & Zhu Chen. 2000.Atlas of sexual
production in angiosperms. China Science
Press, Beijing.
Liese, W. & Weiner, G. 1996. Ageing of
bamboo culms. A review. Wood Science
and Technology, 30:77-89
Liese, W. & Weiner, G. 1997. Modifications
of bamboo culm structures due to ageing
and wounding. In Chapman, G., ed., The
bamboos. The Linnean Society of London,
UK. pp.313-322.
Liese, W. 1998. The anatomy of Bamboo
Culms. International Network for Bamboo
and Rattan Technical Report.
Lybeer B. & G. Koch. 2005. A topochemical and
semiquantitative study of the lignification
during ageing of bamboo culms
(Phyllostachys viridiglaucescens). IAWA
Journal 26(1):99-109.
Murphy, R.J. & Alvin, K.L. 1992. Variation in
fibre wall structure in bamboo. IAWA
Bulletin, 13(4):403-410
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Murphy, R.J. & Alvin, K.L. 1997. Fibre
maturation in bamboos. In Chapman, G.,
ed., the bamboos. Linnaean Society,
London, UK. pp.293-303.
Parameswaran, N. & Liese, W. 1976. On the
fine structure of bamboo fibers. Wood
Science and Technology, 10: 231-246
Parameswaran, N. & Liese, W. 1980.
Ultrastructural aspects of bamboo cells.
Cellulose Chemistry and Technology, 14,
587-609
Xi Mengli & Bao Shaokang. 1997. Study on the
translation from procambium to cambium
in Camptotheca acuminate. Acta Bot.
Boreal. Occident. Sin, 17(5); 83-87
Xiong Wenyu, Ding Zhufu & Li Youfen.1980a.
Intercalary meristem and internodal
elongation of bamboo plants. Scientia
Silvae Sinica, 16(2):81-89
Xiong Wenyu, Qiao Shiyi & Li Youfen. 1980b.
Anatomical structure of culms in
Phyllostachys pubescens. Acta Bot. Sinica,
22(4): 343-348
Zhou Fangchun. Cultivation and utilization
of bamboo. The editorial committee of
bamboo research, Nanjing Forestry
University, Nanjing, China, 1998, pp.59-68.
Bamboo Science and Culture:
The Journal of the American Bamboo Society 19(1): 23-29
© Copyright 2005 by the American Bamboo Society
Soluble carbohydrates and acid invertases involved in the rapid
growth of developing culms in Sasa palmata (Bean) Camus
E. Magel*, S. Kruse, G. Lütje and W. Liese
Abteilung Holzbiologie, Zentrum Holzwirtschaft, Universität Hamburg, Leuschnerstr. 91,
21031 Hamburg, Germany
Developing bamboo culms reach their final height of several meters (5-20) within a very short
period of two to four months This rapid extension growth of bamboo is not well understood and
no information about the physiological and molecular processes underlying this phenomenon exist.
Extension growth is generally turgor-dependent and in many cases is regulated by invertases,
either alone or in combination with sugars and plant hormones. Therefore, we investigated the
pool sizes of the non-structural carbohydrates (glucose, fructose, sucrose, and starch) and the
catalytic activities of acid invertases (soluble and cell wall bound) in the growing culm, in mature
culms of different age-classes, and in the rhizome of bamboo, Sasa palmata. Our data show, that
cell wall invertases (AIcw) dominate in the growing culm, where high catalytic activities of AIcw
create a strong sink for sucrose. In the rapidly growing culm, high activities of cell wall and acid
soluble invertases, together with the resulting high hexose (glucose, fructose) contents correlate
with cell elongation and expansion, possibly by modulating osmotic pressure and cell turgor.
The high availability of hexoses could also be the basis for maintaining a high mitotic activity.
The findings thus give evidence that invertases are involved in the provision of organic solutes,
necessary for elongation growth in bamboo culms.
The growth of a bamboo culm is still a
mystery and not well understood. Only a few
investigations have focused on limited aspects
of this growth phenomenon. The culm grows
by expanding its internodes, whereby cellular
reorganization has been preformed in the buds
(McClure 1997). The rate of daily expansion
varies among species with an average of 5-20 cm
(up to 60-80 cm), until a final length of several
meters (up to 20-25 m) has been reached.
Some of the bigger bamboos, such as Guadua
angustifolia, produce about 500 cm3 wall
substance per day (Liese 2004), amounting to a
total of about 0.1 m3 biomass for the entire
culm. This high quantity of biomass is produced
within the growing season of about 3-5 months.
There is no other plant with a comparable
biomass production. Therefore, bamboos are
considered highly suitable for biomass sequestration plantations, and are discussed with
regard to the Kyoto protocol.
It has to be noted that the growing culm
hardly contributes by itself to the biomass
accumulation: as photosynthetically active leaves
do not develop before full culm expansion (Nath
et al. 2004). During expansion, the culm itself
is covered by a dense layer of culm sheaths
with hardly any net rate of assimilation. In the
late stages of growth this cover is shed,
enabling positive autotrophic carbon gain by the
culm (Judziewicz et al. 1999). Consequently,
the biomass production of an expanding culm
has to be facilitated by internal supplies of
carbon, which are reallocated from storage
tissues of the rhizome and of older, previous
years’ culms.
* Corresponding author:
Phone: ++49 40 73962403
Fax.: ++49 40 428912835
Email: Elisabeth.magel@uni-hamburg.de
23
24
Bamboo Science and Culture
Non-structural carbohydrates are not only
prominent in carbon storage (starch), but also
provide transport of carbon (sucrose), or nutrient
carbon substances in plants. Carbohydrates
also function as metabolic signals and regulatory
molecules, and thus affect the expression of
different classes of genes (Koch 1996, Roitsch
and Gonzalez 2004). Moreover, it is not just
the presence of the carbohydrates that is of
importance, but also the capacity of the tissues
to use them in metabolic processes or facilitate
their import and export that is just as significant.
Sucrose, and the products of its hydrolysis, glucose
and fructose are in this context of central importance. Hydrolysis of sucrose is mediated by
invertases. In plants, three types of invertases
are present. They are located in the apoplast,
the vacuole and the cytoplasm. Besides their
subcellular localization, they are characterized by
their solubility, pH-optima and isoelectric points.
Alone or in combination with sugars and plant
hormones, invertases regulate many aspects of
growth and development of plants (Sturm and
Tang 1999, Roitsch and Gonzalez 2004).
In order to gather information about the
regulation of growth in new bamboo shoots, we
investigated the seasonal changes in pool sizes
of these sugars, and of the levels of activity of
soluble (vacuolar) and cell wall acid invertases
in the rhizome, one-, and two-years-old, as well
as the developing culms of Sasa palmata. Sasa
palmata (Bean) Camus was chosen for this
investigation as it is small and therefore easy to
handle and study. The results, however, can be
extended to the large bamboos.
MATERIALS AND METHODS
Plant material
Sasa palmata plants were investigated
between March 2004 until February 2005.
Specimens of the rhizome, of one-year-old
culms, of two-years-old culms, and current
year culms were harvested in the field near
Hamburg, Germany. In order to follow the
development of the emerging culm in detail,
harvest took place in a weekly course from
March 2004 until May 2004 (March 18th,
March 25th, April 2nd, April 13th, April 20th,
Vol. 19
April 27th, May 2nd, May 10th). During this
time, the diameter of the harvested developing
culms were about 10 mm, whereas the length
extended from 25 cm (April 13th), 70 cm (April
20th), 120 cm (April 27th), 170 cm (May 2nd),
and 220 cm (May 10th), respectively.
Additionally, specimen were collected in summer
(June 15th), fall (October 18th), and winter
(February 3rd, 2005) from fully developed,
current-year culms. For analysis of mature
culms (e.g. one-year-old and two-years-old
culms), material of the 6th internode was used.
Immediately after harvest, the specimen were
quickly frozen. After freeze-drying, the material
was homogenized to a fine powder and kept
under vacuum at -30°C until use.
Determination of starch, glucose, fructose,
and sucrose
Identification of the dominating soluble
carbohydrates was done by thinlayer chromatography (Magel and Höll 1993). As it turned out
that glucose, fructose, and sucrose dominated
by far, their amounts, as well as the amounts of
starch, were quantified enzymatically as
described in Magel et al. (2001). After denaturing
endogenous hydrolytic catalytic activities by
heat treatment, non-structural carbohydrates
were extracted from 6 mg plant material in 750
µl of double or doubly (see below) distilled
water. For quantification, micro plate reader assays
in 96-well micro plates (300 µl cavity volume;
Greiner, Nürtingen, Germany) in a Spectra
Thermo micro plate reader (Tecan, Crailsheim,
Germany) were used.
Preparations of crude extracts for
enzyme assays
Fifteen mg of lyophilized plant material
was mixed with 20 mg of insoluble polyvinylpolypyrrolidone (MW 360000, Polyclar AT,
Serva). Soluble invertases (AIsol) were extracted
by adding 750 µl of ice-cold Tris/borate/
2-mercaptoethanol buffer (100/300/2 mM, pH
7.2; extraction medium I), under occasional
vortexing for 15 min on ice. After centrifugation
(10000g, 10 min, 4°C), aliquots of the supernatants were taken for ammonium sulphate
mediated protein-precipitation (Li et al. 2003).
The precipitated protein was collected by
2005
Magel et al: Physiology of Sasa palmata
centrifugation, redissolved in extraction
medium I, and desalted on a Sephadex G-25
PD-10 column (Amersham Pharmacia biotech,
Sweden; extract I). Ten-µl-aliquots of the
cooled filtrate were used for determination of
the enzyme activities.
Extraction of ionically cell wall bound
invertases (AIicw) was done by re-extraction
of the pellet with buffer of high ionic strength
(extraction buffer supplemented with 2 M NaCl;
extract II). For the measurements of covalently
cell wall bound (insoluble) invertases (AIccw), the
pellet was resuspended with extraction medium
I and the homogenate was used in the assays.
Assays of enzyme activities
The assays of the enzyme activities were
based on the published micro plate reader
assays for pine (Uggla et al. 2001) and walnut
tissue (Magel et al. 2001), and were adapted to
the specific requirements of bamboo tissues.
Activities of AIsol and AIicw were assayed
by quantifying the amounts of glucose and
fructose formed from sucrose in the specific
step (total volume of 70 µl, pH 7.0, 150 mM
Hepes-buffer, containing 3 mM MgSO4, 1.55
mM NADP, 4.07 mM ATP, phosphoglucoseisomerase [4.3 U ml-1], glc6P-dehydrogenase
[2.2 U ml-1], hexokinase [9.2 U ml-1]). For the
assay of AIsol and AIicw, 10 µl of extract I or
II respectively were incubated in a total volume
of 55 µl at pH 4.0 (68 mM citrate/86 mM
phosphate) containing 220 mM sucrose. For
the measurement of the activities of AIccw the
specific step was performed with the
homogenate, at pH 4.0 and 200 mM sucrose.
Termination of the reaction was achieved by
adjusting the pH to 7.5 and centrifugation, and
then amounts of glucose and fructose formed
were quantified in the supernatant (see above).
Blanks were run either with inactivated enzyme
extracts (10min, 98°C), double or doubly (see
above) distilled water and with sample-free
extraction buffer instead of the specific
substrate (sucrose).
Protein determination
The protein content of the extracts (I and II)
was determined in a micro plate assay using
the BIO-Rad (BioRad, Munich) reagens
according to the manufacturer’s protocol.
25
RESULTS AND DISCUSSION
In the bamboo Sasa palmata, like other
photoautotrophic and heterotrophic plant tissues,
glucose, fructose and sucrose constitute the
major soluble carbohydrate fraction. Together with
starch these sugars represent the non-structural
carbohydrates of this bamboo species. In mature
above-ground organs such as one-year-old and
two-years-old culms, the monosaccharides
glucose and fructose dominate the soluble
carbohydrate fraction during the cold season
(February, March), and reach values of up to
120 nmol/mg dw. The high contents of monosaccharides and of sucrose (up to 100 nmol/mg
dw; Figs: 1 b, c) together with low amounts of
starch (down to less than 10 nmol starch-bound
hexoses/mg dw; Figs: 1 b, c) during this period
can be taken as an indication of cryoprotection.
This has also been reported for other perennial
plant organs, such as branches or stems of trees
(Magel et al. 1994, Sauter and Marquardt 1966,
Sauter and Wellenkamp 1998, Sauter et al. 1996).
Starting with higher temperatures towards the
end of March, sucrose becomes the dominating
sugar fraction and starch accumulates in the
parenchyma cells. This is most probably due to
a surplus of photoassimilated products, resulting
in highest amounts of starch in early summer
(for example in conifers see Egger et al. 1996).
In samples of one-year-old and two-years-old
culms collected on April 20th, this steady starch
increase is retarded. During autumn and
winter, starch pools are low in mature culms
(Figs. 1b, c).
In the bamboo under-ground organ, the
rhizome, cryoprotection of the tissue during
wintertime is also characterized by higher
contents of soluble carbohydrates and decreased
pools of starch (Fig. 1a). Contrasting to
overwintering, one-year-old and two-yearsold bamboo culms, rhizones contain sucrose as
the preponderant component of the soluble carbohydrate fraction throughout the year. Starch
contents in the rhizome peak in early spring
(end of March; Fig. 1a) and then later on
during early summer (May, June). Thus, the
rapid spring growth of the new shoots, leads
to reduced total amounts of non-structural
26
Bamboo Science and Culture
Vol. 19
rhizome
two-years-old culm
0
day of harvest
03
18
10
02
10
18
03
10
02
15
06
10
05
02
05
27
04
20
13
04
d
nmol sta-glc/mg dw
0
0
18
20
04
27
05
02
05
10
06
15
10
18
02
03
04
13
02
04
04
18
26
03
15
300
0
0
03
06
300
04
300
900
600
02
100
fru
sta
600
04
600
26
200
900
03
900
glc
suc
03
fru
sta
nmol /mg dw
1200
glc
suc
1200
1200
nmol sta-glc /mg dw
nmol /mg dw
02
developing culm
400
c
27
day of harvest
one-year-old culm
300
05
b
day of harvest
05
18
03
0
02
15
10
18
10
06
02
05
05
20
27
04
04
02
13
04
04
18
03
26
0
03
a
300
20
0
100
04
300
600
13
100
200
04
600
900
04
200
300
fru
sta
26
900
glc
suc
02
300
1200
400
nmol sta-glc/mg dw
1200
04
sta
03
suc
03
fru
nmol /mg dw
glc
nmol sta-glc/mg dw
nmol /mg dw
400
day of harvest
Figure1. Seasonal course of contents of glucose (glc, open bars; nmol/mg dw), fructose (fru, grey bars;
nmol/mg dw), sucrose (suc, losed bars; nmol/mg dw), and starch (sta, closed squares; nmol sta-glc(mg dw) in
the rhizome (a), one-year-old (b), two-years-old (c), and the developing (d) culm of Sasa palmata from March
18th, 2004 (0318), until February 3rd, 2005 (0203). The first two digits identify the month, the second two the
day. Values given are means of three replicates. As standard deviations were lower 5% no SD is given.
carbohydrates in the rhizome (Li et al. 1998).
It is noteworthy, that both the rhizome and the
mature culms exhibit starch levels of up to
1 µmol starch-bound hexoses/mg dw, and thus
starch constitutes more than 20 % of the dry
weight.
Between April 2nd and April 13th, the current
year’s culms emerged (Fig. 1d). On April 13th,
this new shoot was about 25 cm in length. A
constant daily growth rate of about 7 cm was
maintained until the final height of about 220
cm was reached on May 10th. During this
growth period, starch contents were negligible
and soluble carbohydrates reached amounts up
to 1.8 µmol hexoses/mg dw (Fig. 1d); thus
sugars constituted more than 30 % of the dry
weight (for comparison sugar content of the
phloem sap and of sugar storing tissues of sugar
cane and sugar beet is about 15%). Moreover,
hexose-contents found in the elongating tissue
of bamboo culms are 5 fold higher than those
present in the zone of enlarging tracheids within
the cambial differentiation zone of pine trees
(Uggla et al. 2001) and up to 10 fold higher
than in the apical meristem of developing
conifer seedlings (Einig et al. 1999). In vigorous
growing culms, fructose contents exceed by far
the contents of glucose and/or sucrose (Fig.
1d). This implies, that in the developing culm
like in the dividing and expanding tissues of the
cambial region of pine trees, glucose is faster
consumed in metabolic and/or biosynthetic
pathways (Uggla et al. 2001).
Based on these findings, we concluded that
highest concentrations of osmotically active
components in the vigorous growing culm,
such as the monomeric and dimeric carbohydrates, glucose, fructose, and sucrose, enable
the elongation of the bamboo tissue, which
appears to be driven, at least partly, by changes
in the solute potential (Cosgrove 1986,
Hoffmann-Benning et al. 1997).
In rapidly elongating tissues, such as
internodes, fibrous roots, early stages of fruit
expansion, young sink leaves or expanding
cambial cells increased amounts of monomeric
Magel et al: Physiology of Sasa palmata
sugars are associated with high catalytic activities
of soluble acid invertase (Morris and Arthur
1985, Quick and Schaffer 1986, Uggla et al.
2001). Soluble acid invertases are located in
the vacuole. They control sugar composition in
fruits or storage organs, respond to environmental stresses or wounding, and are involved
in osmoregulation and cell enlargement
(Roitsch and Gonzalez 2004). This pivotal role
of acid invertase for cell elongation was also
shown in transgenic tobacco plants, expressing
a yeast-derived invertase in the vacuole
(Hoffmann-Benning et al. 1997). In elongating
bamboo culms, like in tissues which undergo
rapid cell expansion (Tymowska-Lalanne and
Kreis 1998), highest contents of monomeric
sugars coincide in time and tissue distribution
with the highest catalytic activities of acid
soluble invertases, both when calculated on a
dry weight or protein basis (Fig. 2). This can
be taken as further proof that expansion and
elongation of the cellular organization of the
culm, which has been preformed within the
buds, is at least partly controlled by osmotic
pressure and cell turgor.
During these developmental processes, the
heterotrophically growing culm depends on
carbon supply from other tissues. Sharp
decreases in starch pools in the rhizome during
times of the early growing period of the
new culm (April 13th), as well as lower starch
accumulation in the mature culms (April 20th),
indicate a reallocation of stored carbon from
soluble acid invertase
5
8
4
2
8
02
03
06
15
10
1
05
10
05
02
04
20
04
27
0
6
04
02
04
04
04
04
03
6
03
18
0
AIicw
AIccw
AIcw
03
2
0
05
02
05
10
06
15
10
18
02
03
1
20
10
27
2
02
20
13
3
18
4
30
26
40
03
nkat/g dw
6
nkat/g dw
nkat/g dw
nkat/mg pro
50
cell wall invertases
10
nkat/mg protein
60
27
these tissues towards the developing culm. In
addition, current photoassimilates of the older
culms appear to be translocated to the rapidly
growing new culm (Koyama and Ogawa 1993).
In most plant species, carbon is transported
from source to sink tissues in the form of
sucrose. At the sink area, sucrose is exported or
leaked from the translocation path (e.g. sieve
elements) into the apoplast. Here, cell wall
located invertases hydrolyse sucrose into glucose
and fructose. The hexoses are then taken up
into the sink cells by hexose transporters
(Roitsch and Gonzalez 2004). In the rapidly
elongating culm (until May 2nd), high catalytic
activities of cell wall invertases could facilitate
such an import of sucrose into this sink
tissue, and thus indicate apoplastic unloading
in the expanding bamboo culm (Fig. 3).
Ionically bound cell wall invertases dominate
this developmental stage.
After cessation of the growth in height
(June 15th) of the new culm, pools of soluble
carbohydrates, and catalytic activities of the
vacuolar (AIsol) and cell wall (AIicw, AIccw)
invertases were similar to those of mature
culms, whereas starch contents remained low.
In summary we conclude, that cell wall
invertases play an important role in sucrose
partitioning towards the growing culm, and
hydrolysis of sucrose by cell wall invertases
(AIcw) contribute to establishing sink strength
(Sturm and Tang 1999). The correlation
between high activities of AIcw and AIsol, and
04
13
2005
day of harvest
day of harvest
Figure 2. Catalytic activities of soluble, vacuolar acid
invertase calculated on a dry weight (open bars;
nkat/g dw) and protein (closed rectangles; nkat/mg
pro) basis in the developing culm of Sasa palmata.
Values given are means of three replicates. As standard deviations were lower 5% no SD is given.
Figure 3. Catalytic activities of ionically (AIicw; closed
circles; nkat/g dw), covalently (AIccw; open squares;
nkat/g dw), and total (sum of AIicw plus AIccw;
closed triangles; nkat/g dw) cell wall invertases in the
developing culm of Sasa palmata. Values given are
means of three replicates. As standard deviations
were lower 5% no SD is given.
28
Bamboo Science and Culture
the high resulting hexose contents, control cell
elongation and expansion by modulating
osmotic pressure and cell turgor. Most probably,
these sugar supplies are also important for
maintaining high mitotic activity in the growing
culm (Roitsch and Gonzales 2004). Our findings
give evidence that invertases in combination with
sugars regulate growth and elongation of
developing bamboo culms. The biochemical
and genetic regulation of the phenomenon of
rapid growth and elongation of developing
bamboo culms will be the focus of future work.
ACKNOWLEDGEMENTS
The authors thank Prof. Dr. Rüdiger Hampp
(University of Tübingen) for helpful suggestions
and critical reading of the manuscript and
Dennis Wilstermann for assistance in sample
preparation and protein determination.
LITERATURE CITED
Cosgrove, D. 1986. Biophysical control of
plant cell growth. Annual Review of Plant
Physiology 37: 377-405.
Egger, B., W. Einig, A. Schlereth, T. Wallenda,
E. Magel, A. Loewe and R. Hampp. 1996.
Carbohydrate metabolism in 1- and 2-yearold spruce needles and stem carbohydrates
from three months before until three
months after bud break. Physiologia
Plantarum 96: 91-100.
Einig, W., A. Mertz and R. Hampp. 1999.
Growth rate, photosynthetic activity, and
leaf development of Brazil pine seedlings
(Araucaria angustifolia [Bert.] O. Ktze.)
Plant Ecology 143: 23-28.
Hoffmann-Benning, S., L. Willmitzer and
J. Fisahn. 1997. Analysis of growth,
composition and thickness of the cell walls
of transgenic tobacco plants expressing a
yeast-derived invertase. Protoplasma 200:
146-153.
Judziewicz, E.J., L.G. Clark, X. Londono and
M.J. Stern. 1999. American Bamboos.
Smithsonian Institution Press, Washington
London.
Vol. 19
Koch, K.E. 1996. Carbohydrate-modulated
gene expression in plants. Annual Review
of Plant Physiology and Molecular Biology
47: 509-540.
Koyama, N. and Y. Ogawa. 1993. Growth characteristics of Nezasa dwarf bamboo
(Pleioblastus variegatus Makino): 1.
Photosynthesis and utilization of stored
nitrogen. Journal of Japanese Society of
Grassland Science 39: 28-35.
Li, R., M.J.A. Werger, H.J. During and Z.C.
Zhong. 1998. Carbon and nutrient dynamics in relation to growth rhythm in the giant
bamboo Phyllostachys pubescens. Plant
and Soil 210:113-123.
Li, X., M. Pfiz, M. Küppers, W. Einig, H.
Rennenberg and R. Hampp. 2003. Sucrose
phosphate synthase in leaves of mistletoe:
its regulation in relation to host (Abies
alba) and season. Trees 17: 221-227.
Liese, W. 2004. Guadua in Kolumbien.
Bambus Journal 16: 4-6.
Magel, E.A., C. Jay-Allemand and H. Ziegler.
1994. Formation of heartwood substances
in the stemwood of R. pseudoacacia L. II.
Distribution of non-structural carbohydrates and wood extractives across the
trunk. Trees 8: 165-171.
Magel, E.A. and W. Höll. 1993. Storage carbohydrates and adenine nucleotides in trunks
of Fagus sylvatica in relation to discolored
wood. Holzforschung 47: 19-24
Magel E.A., A. Abdel-Latif and R. Hampp.
2001. Non-structural carbohydrates and
catalytic activities of sucrose metabolizing
enzymes in trunks of two Juglans species
and their role in heartwood formation.
Holzforschung 55: 135-145.
McClure, F.A. 1997. The bamboos.
Smithsonian Institution Press, Washington
London.
Morris, D.A. and E.D. Arthur. 1985. Invertase
activity, carbohydrate metabolism and
cell expansion in the stem of Phaseolus
vulgaris L. Journal of Experimental Botany
36: 623-633.
2005
Magel et al: Physiology of Sasa palmata
Nath, A.J., G. Das and A.K. Das. 2004.
Phenology and culm growth of Bambusa
cacharensis R.Majumdar in Barak Valley,
Assam, North-East India. Bamboo Science
and Culture 18: 19-23.
Quick, P. and A.A. Schaffer. 1986. Sucrose
metabolism in sources and sinks. In:
Zamski, E. and A.A. Schaffer (eds.).
Photoassimilate distribution in plants and
crops. Source-sink-relationships. Marcel
Dekker, New York: 115-156.
Roitsch, T. and M.C. Gonzalez. 2004. Function
and regulation of plant invertases: sweet
sensations. Trends in Plant Science 9:
605-613.
Sauter, J.J. and H. Marquardt. 1966.
Untersuchungen zur Physiologie der
Pappelholzstrahlen.
Zeitschrift
für
Pflanzenphysiologie 55: 246-258.
Sauter, J.J. and S. Wellenkamp. 1998. Seasonal
changes in content of starch, protein and
sugars in the twig wood of Salix caprea
L. Holzforschung 52: 255-262.
29
Sauter, J.J., M. Wisniewski and W. Witt. 1996.
Interrelationships between ultrastructure,
sugar levels, and frost hardiness of ray
parenchyma cells during frost acclimation
and deacclimation in poplar (Populus x
canadensis Moench ‘robusta’ wood.
Journal of Plant Physiology 149: 451-461.
Sturm, A. and G.Q. Tang. 1999. The sucrosecleaving enzymes of plants are crucial for
development, growth and carbon partitioning.
Trends in Plant Science 4: 401-407.
Tymowska-Lalanne, Z. and M. Kreis. 1998. The
plant invertases: Physiology, biochemistry
and molecular biology. Advances in
Botanical Research 28:71-117.
Uggla, C., E. Magel, T. Moritz and B.
Sundberg. 2001. Function and dynamics of
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latewood transition in scots pine. Plant
Physiology 125: 2029-2039.
Bamboo Science and Culture:
The Journal of the American Bamboo Society 19(1): 30-31
© Copyright 2005 by the American Bamboo Society
Bamboo Notes1
Contemporary size maxima of Arundinaria gigantea (Walt.) Muhl.
Steven G. Platt
Oglala Lakota College, P.O. Box 490, Kyle, South Dakota, 57752-0490
Christopher G. Brantley
U. S. Army Corps of Engineers, New Orleans District, Environmental Studies Section
(CEMVN-PM-RP), P. O. Box 60267, New Orleans, Louisiana, 70160-0267
Thomas R. Rainwater
The Institute of Environmental and Human Health, Department of Environmental Toxicology,
Texas Tech University, Box 41163, Lubbock, Texas, 79409-1163
Cane, Arundinaria gigantea (Walter)
Muhl., is a monopodial bamboo with erect
culms bearing evergreen foliage, occurring
throughout much of the southeastern United
States (Marsh 1977; Platt and Brantley 1997).
In the past, culms were frequently reported
as growing to 12 m tall and up to 10 cm in
diameter (Michaux 1793-1796; Stoddard
1812; Lyell 1849; McWilliams 1981). Dunbar
(1749-1810) reported culms the “size of a
mans leg or more”, Lawson (1714) stated that
a single culm segment could “hold above a pint
of liquor” and Bartram (in Van Doren 1928)
described culms “as thick as a mans arm”. The
tallest culm recorded was 47 ft (~ 11.4 m) from
the third node to the terminus (Romans 1775;
Platt and Brantley 1997). Culms of the size
described by these early writers apparently no
longer exist (Harper 1928). The largest culms
Meanley (1972) encountered in many years of
searching were 4.5 to 6.0 m tall and 3.1 cm in
diameter. Likewise, the largest culm measured
by Marsh (1977) was 8.2 m tall and 2.5 cm
in diameter. Here we describe a natural stand
of cane containing culms that exceed the
maximum size parameters previously reported
by modern researchers.
We found the stand (30°23.91' N; 91°
08.28' W) on 29 December 2002 along Bayou
Duplantier, approximately 1.5 km downstream
from the bridge at Lee Drive, Baton Rouge,
East Baton Rouge Parish, Louisiana. The
culms are growing sparsely along a 30 m segment of a man-made embankment bordering
an extensive Taxodium distichum swamp.
Although the swamp is subject to frequent
flooding, the cane is sufficiently elevated to
avoid inundation. The embankment supports
a second-growth forest comprised of Celtis
laevigata, Liquidambar styraciflua, Acer
negundo, and Platanus occidentalis, and we
estimate canopy coverage above the cane to be
50%. Understory vegetation associated with
the cane includes Ligustrum sinense, Ligustrum
japonicum, Sambucus canadensis, Lonicera
japonica, and Lygodium japonicum. The age
of the stand is uncertain, but the embankment
on which it is growing was constructed when
Bayou Duplantier was dredged for flood
control between 1953 and 1957 (US Army
Corps of Engineers 1995).
The stand is composed of 38 living, 17
decadent (declining but at least one branch
with living foliage), and 17 dead culms. We
measured the diameter breast height (dbh) of
each culm using tree calipers, and found eight
living and two dead culms with a dbh greater
than 3.1 cm. The largest was a dead culm with
a dbh of 4.1 cm, which we severed at ground
level and determined its height to be 882 cm.
1
Bamboo notes are communications of brief and generally self-evident data not requiring extensive discussion or explanation.
30
2003
Clark: Chusquea renvoizei
The basal portion of this culm and branches
with foliage from an adjacent living culm were
deposited as vouchers in the Clemson
University Herbarium, Clemson, South
Carolina, USA (CLEMS 61611 and 61612).
To our knowledge, this culm represents the
contemporary size maxima for uncultivated
Arundinaria gigantea.
ACKNOWLEDGEMENTS
We thank Mike Leggio and Lucas Jackson for
field assistance, Patrick McMillan for vouchering
specimens, and the librarians at Clemson
University and Louisiana State University for
help in locating obscure references.
LITERATURE CITED
Dunbar, W. 1749-1810. Life, letters, and papers
of William Dunbar. Press of the Mississippi
Historical Society, Jackson.
Harper, R.M. 1928. Economic botany of
Alabama. Part 2. Catalogue of trees,
shrubs, and vines of Alabama, with their
economic properties and local distribution.
Geological Survey of Alabama Monograph
9: 1-357.
Lawson, J. 1714. A new voyage to Carolina.
Garrett Massie Publishing, Richmond,
Virginia (reprinted 1937).
Lyell, C. 1849. A second visit to the United States
of America. Harper and Row, New York.
31
Marsh, D.L. 1977. The taxonomy and ecology
of cane, Arundinaria gigantea (Walter)
Muhlenburg.
Ph.D.
Dissertation,
University of Arkansas, Little Rock.
McWilliams, R.G. (editor and translator).
1981. Iberville’s Gulf Journals. University
of Alabama Press, Tuscaloosa.
Meanley, B. 1972. Swamps, river bottoms, and
canebrakes. Barre Publishing, Barre,
Massachusetts.
Michaux, A. 1793-1796. Journal of travels into
Kentucky. Pages 25-104 in Thwaites, R.G.
(ed.). 1966. Early western travels: 17481846. Vol. 3. AMS Press, Inc., New York.
Platt, S.G. and C.G. Brantley. 1997.
Canebrakes: an ecological and historical
perspective. Castanea 62: 8-21.
Romans, B. 1775. A concise history of East
and West Florida. R. Atkin Publishing, New
York.
Stoddard, A. 1812. Sketches, historical and
descriptive of Louisiana. Matthew Carey
Printer, Philadelphia.
US Army Corps of Engineers. 1995. Amite
River and tributaries, East Baton Rouge
Parish watershed flood control projects.
New Orleans District, New Orleans,
Louisiana.
Van Doren, M. 1928. Travels of William
Bartram, Dover Publications, New York.
32
Bamboo Science and Culture
Vol. 19
F.A. McClure’s photos of the type collection of Chusquea robusta
Chusquea robusta: top, habit; bottom, shoot internode showing culm leaf and branch initiation. Photos taken
by F. A. McClure as part of the type collection (McClure 21431) of this species. From the research archives of
the U. S. National Herbarium, Smithsonian Institution, Department of Botany.
See the article by Clark and Losure on
pages 5-10 of this issue. Scans provided
by Lynn Clark.
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Volume 19
2005
The Journal of the American Bamboo Society
Contents
Distribution of starch in the culms of Bambusa bambos (L.) Voss and its influence
on borer damage
Bhat, K.V., Varma, R.V., Raju Paduvil, Pandalai, R.C., and Santhoshkumar, R. ..........................................1
A new species of Chusquea sect. Longifoliae from Ecuador
Lynn G. Clark and David A. Losure .............................................................................................................5
Aulonemia dinirensis (Poaceae: Bambusoideae: Bambuseae) a new dwarf Venezuelan
species from the easternmost Andean páramos
Emmet J. Judziewicz and Ricarda Riina ....................................................................................................11
Developmental anatomy of the fiber in Phyllostachys edulis culm
Gan Xiaohong and Ding Yulong.................................................................................................................16
Soluble carbohydrates and acid invertases involved in the rapid growth of developing
culms in Sasa palmata (Bean) Camus
E. Magel, S. Kruse, G. Lütje and W. Liese..................................................................................................23
Contemporary size maxima of Arundinaria gigantea (Walt.) Muhl.
Steven G. Platt, Christopher G. Brantley and Thomas R. Rainwater ........................................................30
F.A. McClure’s photos of the type collection of Chusquea robusta............................................................32
Gerald F. Guala, Ph.D.
Editor-in-Chief
Bamboo Science and Culture
P.O. Box 74490
Baton Rouge, Louisiana 70874-4490 USA
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