DOI: http://dx.doi.org/10.22092/ijb.2013.3002
ANATOMICAL AND POLLEN CHARACTERS IN ACANTHOPHYLLUM C. A.
MEY. (CARYOPHYLLACEAE) FROM NORTHEAST OF IRAN
M. Mahmoudi Shamsabad, H. Ejtehadi, J. Vaezi & F. Memariani
Received 28.07.2012. Accepted for publication 08.11.2012.
Mahmoudi Shamsabad, M., Ejtehadi, H., Vaezi, J., Memariani, F. 2013 06 30: Anatomical and Pollen Characters in
Acanthophyllum C. A. Mey. (Caryophyllaceae) from northeast of Iran. –Iran. J. Bot. 19 (1): 107-118. Tehran.
Palynological and anatomical features of 11 species from NE Iran belonging to Acanthophyllum sect. Oligosperma
were carried out and evaluated by numerical methods to determine the taxonomic value of endomorphic characters.
The cross section of stems, peduncles and leaves were prepared and stained with Safranin and Fast-green and pollen
morphology has been examined by light and scanning electron microscope. The principal component analysis and
Cluster Analysis results showed that the type of stomata, shape and size of epidermal cells, trichomes, the number of
epidermal cells and stomata, the shape of stem cross section, arrangment of xylem elements in peduncle, arrangment
of mesophyll in leaf and the number of sclerenchymatous layers are significant to separating species. The pollen
grains were spheroid, pantoporate, ornamentation was scabrate-punctate and exine structure was spinulose-punctate.
Masoumeh Mahmoudi Shamsabad (correspondence, <ma_ma648@stu-mail.um.ac.ir>), Department of Biology,
Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran. –Hamid Ejtehadi, Department of Biology,
Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran -Jamil Vaezi, Department of Biology, Faculty
of Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran. –Farshid Memariani, Research Centre for Plant
Sciences, Ferdowsi University of Mashhad, Mashhad, Iran.
Key words. Anatomy, Pollen Morphology, Acanthophyllum, Caryophyllaceae, Numerical Analysis, Iran.
( در ﺷﻤﺎل ﺷﺮق اﻳﺮانAcanthophyllum C. A. Mey) ﺑﺮرﺳﻲ ﺻﻔﺎت ﺗﺸﺮﻳﺤﻲ و ﮔﺮده ﺷﻨﺎﺳﻲ ﺟﻨﺲ ﭼﻮﺑﻚ
. داﻧﺸﺠﻮي ﻛﺎرﺷﻨﺎﺳﻲ ارﺷﺪ داﻧﺸﮕﺎه ﻓﺮدوﺳﻲ ﻣﺸﻬﺪ،ﻣﻌﺼﻮﻣﻪ ﻣﺤﻤﻮدي ﺷﻤﺲآﺑﺎد
. اﺳﺘﺎد ﮔﺮوه زﻳﺴﺖﺷﻨﺎﺳﻲ داﻧﺸﮕﺎه ﻓﺮدوﺳﻲ ﻣﺸﻬﺪ،ﺣﻤﻴﺪ اﺟﺘﻬﺎدي
. اﺳﺘﺎدﻳﺎر ﮔﺮوه زﻳﺴﺖﺷﻨﺎﺳﻲ داﻧﺸﮕﺎه ﺷﻬﻴﺪ ﭼﻤﺮان اﻫﻮاز،ﺟﻤﻴﻞ واﻋﻈﻲ
. ﻋﻀﻮ ﻫﻴﺄت ﻋﻠﻤﻲ ﭘﮋوﻫﺸﻜﺪه ﻋﻠﻮم ﮔﻴﺎﻫﻲ داﻧﺸﮕﺎه ﻓﺮدوﺳﻲ ﻣﺸﻬﺪ،ﻓﺮﺷﻴﺪ ﻣﻌﻤﺎرﻳﺎﻧﻲ
در ﺷﻤﺎل ﺷﺮﻗﻲ اﻳﺮان ﺑﺎ اﺳﺘﻔﺎده از ﺗﺎﻛﺴﻮﻧﻮﻣﻲSect. Oligosperma از ﺑﺨﺶAcanthophyllum ﮔﻮﻧﻪ11 ﺻﻔﺎت ﺗﺸﺮﻳﺤﻲ و ﮔﺮدهﺷﻨﺎﺳﻲ
دﻣﮕﻞ و ﺑﺮگ ﺗﻬﻴﻪ و ﺳﭙﺲ ﺑﺎ ﺳﺎﻓﺮاﻧﻴﻦ و ﻓﺴﺖﮔﺮﻳﻦ رﻧﮓ آﻣﻴﺰي ﺷﺪ و، ﺑﺮشﻫﺎﻳﻲ از ﺳﻄﺢ ﻣﻘﻄﻊ ﺳﺎﻗﻪ.ﻋﺪدي ﻣﻮرد ﺑﺮرﺳﻲ ﻗﺮار ﮔﺮﻓﺖ
ﺷﻜﻞ و اﻧﺪازه، ﻧﺘﺎﻳﺞ ﻧﺸﺎن داد ﺻﻔﺎت ﻧﻮع روزﻧﻪ.ﻣﻮرﻓﻮﻟﻮژي داﻧﻪﻫﺎي ﮔﺮده ﺑﺎ اﺳﺘﻔﺎده از ﻣﻴﻜﺮوﺳﻜﭗ ﻧﻮري و اﻟﻜﺘﺮوﻧﻲ ﺑﺮرﺳﻲ ﺷﺪﻧﺪ
آراﻳﺶ آوﻧﺪﻫﺎي ﭼﻮب در، ﺷﻜﻞ ﺳﻄﺢ ﻣﻘﻄﻊ ﺳﺎﻗﻪ، ﺗﻌﺪاد ﺳﻠﻮلﻫﺎي اﭘﻴﺪرﻣﻲ و روزﻧﻪ در واﺣﺪ ﺳﻄﺢ، ﻧﻮع ﻛﺮك،ﺳﻠﻮلﻫﺎي اﭘﻴﺪرﻣﻲ
داﻧﻪﻫﺎي ﮔﺮده در اﻳﻦ ﺟﻨﺲ. آراﻳﺶ ﻣﺰوﻓﻴﻞ در ﺑﺮگ و ﺗﻌﺪاد ﻻﻳﻪﻫﺎي اﺳﻜﻠﺮاﻧﺸﻴﻤﻲ در ﺗﻔﻜﻴﻚ ﮔﻮﻧﻪﻫﺎي اﻳﻦ ﺑﺨﺶ ﻣﻔﻴﺪ ﺑﻮدﻧﺪ،دﻣﮕﻞآذﻳﻦ
. زﺑﺮﻧﻘﻄﻪاي و ﺳﺎﺧﺘﺎر اﮔﺰﻳﻦ ﺧﺎردار ﻧﻘﻄﻪاي اﺳﺖ، ﭼﻨﺪ ﻣﻨﻔﺬي،ﻛﺮوي
INTRODUCTION
Acanthophyllum C. A. Mey. belongs to the family
Caryophyllaceae,
subfamily
Caryophylloideae.
Acanthophyllum with about 60 species is distributed in
the Irano-Turanian region (Takhtajan 1986, SchimanCzeika 1988) and adapted to deserts, mountains and
temperate areas (Ghaffari 2002). The northeast of Iran
and adjacent regions in Afghanistan and Turkmenistan
are the main centers of diversification for the genus
(Ghaffari 2004). Acanthophyllum is represented in Iran
with 33 species, 23 out of which are endemics.
However, in recent investigation on the Iranian
Acanthophyllum species, Basiri & al. (2011) have
introduced seven synonyms and five reductions to the
IRAN. J. BOT. 19 (1), 2013
Mahmoudi Shamsabad & al. 108
Table 1. Voucher specimens of Acanthophyllum species used in the study.
species
localities
A. adenophorum Freyn
Khorassan, NE Bojnourd, between Ali Muhammad and Robat, 1500 m, 4/7/1993,
23578, Faghihnia and Zangooei
A. borsczowii Bunge ex Boiss. Khorassan, S Sabzevar, Hares Abad desert park, 800 m, 1/6/1991, 20553, Joharchi
and Zangooei
A. korshinskyi Schischk.
Khorassan, NE Qayen, Tikab, 1200 m, 28/5/1995, 25602, Rafei and Zangooei
A. speciosum Rech. f. &
Schiman- Czeika
A. laxiusculum SchimanCzeika
A. heratense Schiman- Czeika
A. lilacinum Schischk
A. squarrosum Boiss.
A. diezianum Hand-Mzt.
A. brevibracteatum Lipskyi
A. pachystegium Rech. f.
Khorasan, NE Kalat Naderi, 1200 m, 24/5/1994, 24041, Faghihnia and Zangooei
Khorassan, E Bajestan, between Hojat Abad and Helali, 1250 m, 9/5/1998, 30525,
Rafei and Zangooei
Khorassan, N Bojnurd, 8 km north of Jow-Darreh, 1600 m, 11/6/1996, 27190,
Rafei and Zangooei
Khorassan, NW Gonabad, 1300 m, 14/5/1997, 26895, Rafei and Zangooei
Khorassan, NE Bojnurd, between Naveh & Qatlish, ca. 3 km on Izman bifurcation
road, 1250 m, 17/6/2009, 43145, Memariani and Zangooei
Khorassan, NW Qayen, 6 km east of Karghand village, 1700 m, 19/5/1998, 30764,
Joharchi and Rafei
Khorassan, N Kashmar, 10 km south of Ataieh, 1700 m, 25/5/1999, 32615, Hojjat
and Zangooei
Khorassan, NW Bojnurd, Jargalan area, 3 km from Baqleq towards Guy-Nik, 1430
m, 11/6/2008, 40772, Memariani and Zangooei
rank of variety for the genus; accepting 21 species in
Iran. Based on the Flora Iranica (Schiman-Czeika
1988), the genus has been divided into seven sections.
The sect. Oligosperma, with 23 species worldwide,
stand as the largest section of the genus of which 16
occur in Iran (Schiman-Czeika 1988). The members of
this section are identified by dense flowers, spherical
terminal heads, calyx (4) 6-12 mm long, calyx-teeth 1-2
mm long and 4-ovuled ovary (Schiman-Czeika 1988,
Shishkin, 1936).
Anatomical characters are less influenced by
environmental condition than morphological characters
and are more uniform from one population to another
(Bokhari 1987). Generally, variation of morphological
characters within family Caryophyllaceae makes taxa
complicated to be delineated and identified (Fior & al.
2006). In Acanthophyllum species like other
Caryophyllaceae genera there are extreme variety in
population that causes difficalties to distinguish. In
order to resolve problems, with respect to effect of
environmental codition on morphology characters, the
need of survey on endomorphic characters is nessesary
and helps to identify species (Sahreen & al. 2008, Kilic
2009).
There have been no anatomical and palynological
studies on this genus so far. The previous studies that
carried out on anatomy of Caryophyllaceae had been
done by Metcalfe and Chalk (1983). Schwingruber
(2007) described and analysed the xylem and phloem
of 88 species from Caryophyllaceae. Kilic (2009)
investigated anatomical and pollen characters in the
genus Silene from Turkey. The earlier palynology
studies on Caryophyllaceae had been done by Perveen
and Qaiser (2006); they studied 74 species of the
family Caryophyllaceae from Pakistan.
The aim of this paper is to do anatomical and
palynological studies for 11 species of the
Acanthophyllum sect. Oligosperma in northeastern Iran
including A. borsczowii Litw., A. speciosum Rech. f. &
Schiman-Czeika, A. korshinskyi Schischk., A.
pachystegium Rech. f., A. adenophorum Freyn., A.
lilacinum Schischk., A. brevibracteatum Lipsky., A.
diezianum Hand.-Mzt., A. laxiusculum SchimanCzeika, A. squarrosum Boiss., and A. heratense
Schiman-Czeika and to evaluate their taxonomical
application
MATERIALS AND METHODS
The anatomical and palynological investigations are
based on the herbarium specimens obtained from
FUMH (Ferdowsi University of Mashhad Herbarium).
The list of these species is given in Table 1. The pollen
grains extracted from the anther and dehydrated by
acetic acid, then acetolyzed according to Erdtman
(1960). Pollen grains were mounted in glycerine-jelly
to make permanent slides and observed with Olympus
BH-2 microscope under oil immersion. For scanning
electron microscope studies, the pollen grains coated
109 Anatomical and pollen characters in Acanthophyllum
with gold and examination was carried out on
LEO1450VP microscope. Pollen terminology followed
here is based on Punt & al. (1994). Measurements were
based on 20 pollen grains per specimen. For anatomical
study, leaves and stem were taken from the middle
parts of specimens and epidermal surface were taken
from the lower parts of leaves. The number of stomata
and epidermal cell was considerd in 1mm².
For soften, all materials were embeded in glycerine:
ethanol: distilled water for three months, then fixed in
FAA for 72 h. All sections cut by hand and staind with
Safranin and Fast-green and mounted in entellan to
make permanent slides. Pictures were taken by
Olympus BH-2 microscope that connected to a Dino
lite cammera. Qualitative and quantitative characters
were based on 10 observations
Anatomical and palynological characters. A total of 63
including 53 quantitative and 10 qualitative characters
were examined on each specimen (Table 2). Qualitative
characters were scored as binary or multistate
characters. In this investigation missing data
replacement were made with the means of variables
(Legendre and Legendre 1998).
Numerical methods. For collection, the characters that
found to be functional in separating an apriori group
several runs of PCA were carried out. Only those
quantative characters allow to be contributed that
variability of the first three axes of the PCA (r>0. 5)
and had the least correlation (r <0.5) were used to
differentiate specimens from each other. The results of
these investigations are based on Principal Component
Analysis (PCA) and Cluster Analysis (CA) that carried
out based on UPGMA method and Euclidian distance
as a disimilarity cofficience and was performed using
NTSYS software Version 2 (Rohlf 1998). For selecting
diagnostic characters, PCA was performed using
CONACO software Version 4.5 (Ter Braak 1988).
RESULTS
Leaf epidermal anatomy
Stomata. A. speciosum, A. korshinskyi, A. pachystegium,
A. adenophorum, A. lilacinum, A.brevibracteatum, A.
diezianum, A. laxiusculum and A. heratense have
diacytic, anomocytic and anisocytic types of stomata
while A. borsczwii has only anomocytic and A.
squarrosum has diacytic type of stomata (Fig. 1).
Trichomes.
Acanthophyllum
pachystegium,
A.
adenophorum and A. lilacinum have glandular and
eglandular hairs, A. brevibracteatum, A. diezianum, A.
laxiusculum, A. heratense and A. squarrosum have
multicellular and unicellular eglandular hairs while A.
korshinskyi has short glandular hairs. A. speciosum has
2-4 celled glandular hairs and in A. borsczowii
unicellular eglandular hairs are observed.
IRAN. J. BOT. 19 (1), 2013
Shape of epidermal cells. The shape of epidermal cells
is irregular, rectangular and polygonal with crenate or
entire subsidary cells. Acanthophyllum pachystegium,
A. adenophorum, A. lilacinum, A. brevibracteatum, A.
speciosum and A. korshinskyi have irregular epidermal
cells with crenate walls and A. borsczowii has
polygonal cells with entire walls while A. heratense, A.
laxiusculum, A. squarrosum and A. diezianum have
rectangular cells with entire walls.
Size of epidermal cells. The lenght of epidermal cells in
Acanthophyllum species are diffrent from .053 µm
(smallest) in A. heratense to 0.12 µm (largest) in A.
laxiusculum (Table 3)
Palynological analysis
Pollen shape, type, size, ornamentation and structure.
Pollen grains are radially symmetrical and spheroidal;
the type of pollen grain is pantoporate. The grains have
median size (23-31 µm), this character is diffrent from
24.5µm polar axes and 23.8 µm equatorial axis in A.
borsczowii (smallest) to 30.7 µm polar axes and
30.3µm equatorial axis in A. adenophorum (largest)
(Table 4). Pollen ornamentation is scabrate-punctate
and exin structure is spinulose-punctate (Figs. 2 and 3)
Anatomical characters
Cuticular layer 2-4 µm thick. Epidermis consist of a
single layer of orbicular or rectangular cells located
close to several parenchymatous layers with druse
crystals. Several sclerenchymatous layers including
thick and thin walled cells that surrounded vascular
bundle. The pith is hollow or filled with large thin
walled cells in some species contain druse crystals. The
important indicative anatomical characters that we
found for separation of taxa are as follows:
Stem cross section shape and size. In A. borsczowii the
stem in cross section is rectangular-elliptical and have
the greatest size (1.8 mm length and 1.135 mm width),
in other species stem cross section is more or less
elliptical-circular and A. pachystegium has the smallest
stem cross section (0.979 mm length and 0.793 mm
width) (Fig. 4).
The number of sclerenchymatous and parenchymatous
layers in stem. Sclerenchymatous thin walled cells
layers are well developed in A. borsczowii (8-9 layers)
and occupied about 70% of stem radious whereas
sclerenchymatous thick walled cell layers are expanded
in A. korshinskyi and A. adenophorum, this character
defined in the fewest amount in A. lilacinum, A.
pachystegium, A. borsczowii and A. brevibracteatum
(0-2 layers). Parenchymatous cell layers defind in the
greatest amount in A. brevibracteatum and A.
speciosum and occupied 30-40% of stem radious (about
6 layers).
IRAN. J. BOT. 19 (1), 2013
Mahmoudi Shamsabad & al. 110
Table 2. Anatomical and palynological characters used in this study, followed by their abbreviations. The qualitative
characters denoted by asterisks, character states and considered scores are given in square brackets.
Pollen
Leaf epidermis
Indumentum
Stem
Peduncle
Leaf
Equatorial axis
Polar axis
Length of pores
P/E rate
Exine thickness
Average distance between pores
Number of micropores (mm²)
*type of epidermal cells [ entire:1, crenate:2]
Length of epidermal cells
Width of epidermal cells
Number of epidermal cells
Length/width of epidermal cells
Length of stomata
Width of stomata
Length/Width of stomata
Guard cell length
Guard cell width
Length/Width of guard cell
Number of stomata
*Unicellular simple hair [absent:0, present:1]
*Multicellular simple hair [absent:0, present:1]
*Short glandular hair [absent:0, present:1]
*Long glandular hair [absent:0, present:1]
*Crystal in parenchymatous layer [absent:0, present:1]
*Shape of stem cross section [Rounded = 0, elliptic = 1]
Length of stem cross section
Width of stem cross section
Number of sclerenchymatus layers cell
Number of parenchymatous layer
Size of phloem
Size of xylem
Width of vascular bundle
Size of xylem/phloem ratio
Size of pith
Length of vascular bundle
Size of greatest xylem element
Size of cuticle
Length of peduncle cross section
Width of peduncle cross section
Length/width of peduncle cross section
Size of cuticle
Size of epidermal layer
Size of parenchymatous layer
Number of sclerenchymatus layer
Number of parenchymatous layer
Size of phloem
Size of xylem
Size of pith
Width of vascular bundle
Length of vascular bundle
Length/width of vascular bundle
Size of greatest xylem element
*Arrangment of xylem elements [ solitary:1, radial chain pore:2, cluster:3]
Size of greatest xylem element
Number of sclerenchymatus layers cell
Size of lower epidermal cell
Size lower parenchymatous layer
Lenght of leaf cross section
Width of leaf cross section
Length/width of leaf cross section
*Crystal in leaf [ scarcely:0, densely:1]
*Arrangment of mesophyll [ isolateral 1, dorsiventral 2]
Length of lamina
EQAP
POAP
LEPP
PERP
EXTP
ADBP
NMIP
TEPE
LECE
WECE
NUCE
LWIE
LSTE
WSTE
LWSE
GCLE
GCWE
LWGE
NSTE
UNSH
MUSH
SGLH
LGLH
CRPS
SHAS
LCRS
WCRS
NSCS
NPAS
SPHS
SXYS
WVAS
SXPS
SPIS
LVAS
SGXS
SICS
LCRI
WCRI
LWCI
SCUI
SEPI
SPAI
NSCI
NPAI
SPHI
SXYI
SPII
WVAI
LVAI
LWVI
SXYI
AXYI
SGXI
NSCL
SLEL
SLPL
LCRL
WCRL
LWCL
CRYL
ARML
LELL
IRAN. J. BOT. 19 (1), 2013
111 Anatomical and pollen characters in Acanthophyllum
Table 3. Leaf epidermal features of Acanthophyllum species in adaxial surface. The measurements are in mm.
Taxon
Epidermal
cells lenght
A. adenophorum 0.1
0.051
Number of
Stomata
epidermal cell in width
1mm²
14
0.02
A.
0.106
brevibracteatum
0.051
7
0.029
0.043
2
0.041
0.012
A. diezianum
0.082
0.066
11
0.03
0.033
3
0.028
0.013
A. borsczowii
A. heratense
0.054
0.053
0.071
0.037
11
16
0.026
0.027
0.027
0.031
3
5
0.027
0.029
0.013
0.012
A. korshinskyi
0.11
0.058
12
0.032
0.034
3
0.035
0.01
A. laxiusculum
0.12
0.051
11
0.028
0.035
2
0.031
0.029
A. lilacinum
0.093
0.039
13
0.029
0.036
2
0.032
0.01
0.062
12
0.028
0.035
3
0.035
0.013
A. pachystegium 0.07
Epidermal
cells width
Stomata
lenght
0.03
Number of
stomata in
1mm²
4
Guard
cell
lenght
0.025
Guard
cell
width
0.014
A. speciosum
0.095
0.032
16
0.026
0.035
5
0.028
0.012
A. squarrosum
0.082
0.055
15
0.024
0.026
5
0.029
0.011
Table 4. General pollen characters of the examined Acanthophyllum species.
Taxon
Polar axis Equatorial axis
P/E
Pores diameters
30.7
30.3
1.013201
4.5
A. adenophorum
28.9
28.2
1.024823
4.5
A.brevibracteatum
24.7
24.6
1.004065
3.2
A.diezianum
24.5
23.875
1.026178
3.7
A. borsczowii
25.4
24.9
1.02008
3.7
A.heratense
27.6
26.8
1.029851
3.6
A.korshinsky
26.1
25.2
1.035714
4.5
A.laxiusculum
29.2
28.9
0.989726
5.2
A.lilacinum
29.4
29.4
1
6
A.pachystegium
30.6
30.25
1.001637
5
A.speciosum
26.75
26.4
1.013258
4.1
A.squarrosum
Pith size and distribution of crystals. Size of pith in A.
adenophorum and A. borsczowii is the greates amount
(about .28 mm) and druse crystals are seen densly in
the pith of A. laxiusculum.
The arrangment of xylem elements in peduncle and size
of them. This character is different among the
Acanthophyllum species and divided this section into
three groups as i) A. borsczowii with solitary elements
Exine thickness
1.4
1.5
1.4
1.6
1.9
1.5
1.6
1.9
2
2
1.47
Stomata type
diacytic,
anomocytic,
anisocytic
diacytic,
anomocytic,
anisocytic
diacytic,
anomocytic,
anisocytic
anomocytic
diacytic,
anomocytic,
anisocytic
diacytic,
anomocytic,
anisocytic
diacytic,
anomocytic,
anisocytic
diacytic,
anomocytic,
anisocytic
diacytic,
anomocytic,
anisocytic
diacytic,
anomocytic,
anisocytic
diacytic
Pores distance
10.2
8.5
8
7
8.3
6.4
8.7
10.8
8.6
11.5
7.92
ii) A. diezianum, A. lilacinum, A. heratense, and A.
squarrosum have radially chain pore arrangement iii)
cluster or radially chain pore arrangement with cluster
elements are observed in A. laxiusculum, A.
pachystegium, A. brevibracteatum, A. korshinskyi, and
A. adenophorum (Fig. 5). The size of xylem elements is
maximum in A. borsczowii, A. adenophorum, A.
lilacinum, and A. korshinskyi (> 0.02 mm). This
IRAN. J. BOT. 19 (1), 2013
Mahmoudi Shamsabad & al. 112
A
B
C
D
Fig. 1. Epidermal surface of some Acanthophyllum species. A: A. borsczowii, B: A. squarrosum, C: A. laxiusculum,
D: A. lilacinum.
Fig. 2. The SEM micrographs of pollen grains in Acanthophyllum adenophorum.
113 Anatomical and pollen characters in Acanthophyllum
IRAN. J. BOT. 19 (1), 2013
Fig. 3. The LM micrographs of pollen grains in Acanthophyllum adenophorum.
A
B
Fig. 4. The cross section of stem in Acanthophyllum borsczowii (A) and A. korshinskyi (B). E= Epidermis, P=
Parenchymatous layers, Cr= Crystal, S= Sclerenchymatous layers, Ph= phloem, X= xylem, Pi= pith
IRAN. J. BOT. 19 (1), 2013
Mahmoudi Shamsabad & al. 114
A
B
C
Fig. 5. The peduncle cross section of some Acanthophyllum species. A: A. borsczowii, B: A. squarrosum, C: A.
adenophorum.
A
B
Fig. 6. The leaf cross section in Acanthophyllum diezianum (A) and A. korshinskyi (B).
115 Anatomical and pollen characters in Acanthophyllum
IRAN. J. BOT. 19 (1), 2013
Fig. 7. Phenogram resulting from the UPGMA of Acanthophyllum sect. Oligosperma in Khorassan provinces.
OTU’S represented by: A: A. adenophorum, P: A. pachystegium, K: A. korshinskyi, Li: A. lilacinum, Sp: A.
speciosum, D: A. diezianum, Sq: A. squarrosum, H: A. heratense, La: A. laxiusculum, Br: A. brevibracteatum, B: A.
borsczowii.
character is minimum in A. laxiusculum, A. heratense,
A. squarrosum, and A. pachystegium (<0.02 mm).
The number of sclerenchymatous layers in
peduncle. Sclerenchymatous layers are not observed in
A. borcszowii peduncle while A. pachystegium, A.
brevibracteatum, A. diezianum, A. squarrosum and A.
adenophorum,
have
greatest
amount
of
sclerenchymatous layers (4-7 layers).
The arrangment of mesophyll. This character is
different among Acanthophyllum species and divided
examined species into two groups as A. diezianum, A.
laxiusculum, A. squarrosum and A. heratense had
dorsi-ventral arrangment while A. borsczowii, A.
korshinskyi, A. pachystegium, A. speciosum, A.
adenophorum and A. brevibracteatum had isolateral
arrangment (Fig. 6).
The number of sclerenchymatous layers in leaves.
Sclerenchymatous thick walled cells layers are not
observed in A. borsczowii while these layers difind in
the greatest amount in A. korshinskyi, A. adenophorum,
A. brevibracteatum and A. pachystegium.
Lamina size and druse crystal distribution. Lamina size
in A. borsczowii is longer than 1 mm and druse crystal
are seen densly in its lamina while in all other
examined species lamina size is smaller than 0.5 mm.
Cluster analysis of micromorphological
characters
The UPGMA of the OTU’S used in this study is shown
in Fig 7. The arrangement of species in cluster was
written in the left of cluster. The phenogram is divided
into two clusters. Acanthophyllum borsczowii is
separated from the rest of species in a single species
cluster. In addition, the other cluster is divided into two
branches. In the upper branch located A. adenophorum,
A. pachystegium, A. korshinskyi, A. lilacinum and A.
speciosum, in the lower branch A. laxiusculum, A.
heratense and A. squarrosum located close together.
Principal component analysis of micromorphological
characters. Only characters that have high eigenvalue
on the first three principal component (r>0.5) and had
the least correlation coefficient (r< 0.5) were selected
to separate OTU’s (Table 5). The first three
components explain 94 % of the total character
variation 64%, 23% and 7 % for the respective axes. In
a plot of the first and second PCs (Fig. 8); the number
of sclerenchyma thick walled layers in leaf (NSCL)
character are isolated A. korshinskyi and A.
pachystegium from the other taxa. Lenght of lamina
(LELL), the size of greatest xylem elements in stem
IRAN. J. BOT. 19 (1), 2013
Mahmoudi Shamsabad & al. 116
PC2
PC3
PC1
Fig. 8. Principal Component Analysis- Scatter diagram of specimens and characters from 11 species of
Acanthophyllum sect. Oligosperma in Khorassan provinces. 1: A. adenophorum, 2: A. brevibracteatum, 3: A.
borsczowii, 4: A. diezianum, 5: A. heratense, 6: A. pachystegium, 7: A. laxiusculum, 8: A. lilacinum, 9: A.
korshinskyi, 10: A. speciosum, 11: A. squarrosum.
(SXYS) and the size of the greatest xylem elements in
peduncle (SXYI) are the characters that separated A.
borsczowii. Acanthophyllum heratense and A.
squarrosum are isolated from the rest by length/width
of epidermal cells (LWIE); the number of epidermal
cells (NUCE) separates A. speciosum. Long glandular
hairs (LGLH) character differentiates A. lilacinum.
Multicellular simple hairs (MUSH) and arrangement of
xylem elements (AXYI) are the characters that
excluded A. adenophorum. A. laxiusculum is
distinguished by size of phloem in peduncle (SPHI) and
the number of sclerenchymatous layers in peduncle
(NSCI) character exluded A. diezianum from the other
taxa.
IRAN. J. BOT. 19 (1), 2013
117 Anatomical and pollen characters in Acanthophyllum
Table 5. Eigen vectors of the characters used on the first three axes in the PCA.
N
NAME
AX1
AX2
AX3
AX4
1
MUSH
0.5833
-0.037
0.0831
0.0052
3
LGLH
0.5148
-0.2294
0.005
0.7133
4
AXYI
0.5457
-0.2162
0.3366
0.7491
8
NUCE
0.3274
-0.9442
0.0042
-0.0359
9
LWIE
0.9909
0.1293
-0.0336
-0.0156
10
SXYS
-0.0084
0.5253
0.3243
-0.224
12
SGXS
0.5606
0.3005
0.0164
-0.0071
13
SCPI
-0.4968
0.5469
0.174
-0.2294
14
SPAI
-0.2518
0.5479
0.0886
0.2556
15
NSCI
0.5708
0.7156
-0.1937
-0.1455
16
SPHI
0.0107
0.5748
-0.4096
0.3501
17
SXYI
0.5156
0.4294
-0.2917
-0.2049
22
NSCL
0.1791
0.0709
0.9737
-0.1205
25
LELL
0.1392
0.5612
0.1306
-0.3428
DISCUSSION
The present study matches with the results of SchimanCzeika (1988) and Shishkin (1936) who reported
different type of trichomes in Acanthophyllum species.
Schiman-Czeika (1988), in Flora Iranica, described A.
borsczowii as a glabrous plant but our result is in
agreement with Bidi (2007) who reported unicellular
simple hairs on A. borsczowii. The basic type of
stomata is diacytic in Caryophyllaceae family
according to Metcalfe and Chalk (1983) while in A.
borsczowii the anomocytic type of stomata was
observed. Some other stomata types such as anisocytic
and anomocytic were observed in several species
(Table 3). This study is also in agreement with Jafari &
al. (2008) who reported crenate and entire subsidiary
cell walls in some species of Silene. Similarly,
anisocytic and anomocytic types of stomata were
reported in some Silene species by Sahreen et al.
(2010).
In Acanthophyllum species pollen grains are fairly
uniform with radially symmetrical and pantoporate
grains, although, our results showed differences in
pollen size, distance between two pori and number of
pores but these variation were not remarkable and are
not important characters for taxonomy of
Acanthophyllum species.
Stem anatomy was somewhat simillar in the
examined taxa, but stem cross section shape and size,
the number of sclerenchymatous layers are
taxonomically significant to identify species.
In this study calcium oxalate crystals are observed
both in endodermis and pith that are dissent with
Metcalfe and Chalk (1950). They reported that crystals
in Caryophyllaceae are placed only in endodermis.
However, it is well known that it is an environmentally
influenced anatomical character and we cannot use it as
a strong taxonomic character for grouping species
(Kilic 2009). The number of sclerenchymatous layers
difined in the greatest amount in A. borsczowii, it
should be mentioned that the stem in this species
contrary to the other species of the section except for A.
elatius Bunge ex Boiss. is vertical.
The arrangment of xylem in peduncle and the
arrangment of mesophyll in leaf were qualitative
characters that taxonomically significant to separating
Acanthophyllum species. The second character was
removed in the PCA analysis due to the high
correlation coefficient on the PCA analysis. Examined
species have been divided to three groups by the
arrangment of xylem elements character in peduncle;
these species are well separated by morphological
characters too.
The results of the cluster analysis (Fig. 7) indicated
that A. laxiusculum, A. squarrosum and A. heratense
are linked together that are in agreement with Basiri &
al. (2011) taxonomic results. They concluded that the
species A. heratense and A. laxiusculum are as
synonyms. With respect to the proximity of A.
heratense habitat to A. laxiusculum and A. squarrosum,
molecular study and a ditailed morphological study on
IRAN. J. BOT. 19 (1), 2013
these three species in the field are suggested.
The results showed endomorphic characters in
Acanthophyllum species are only useful to separate the
species that are morphologically apart, as the species A.
adenophorum, A. pachystegium and A. lilacinum that
are morphologically similar having more or less
irregular epidermal cells with wavy walls, glandular
and eglandular hairs, cluster or radial chain pore with
cluster elements, leaf with isolateral mesophyl and also
generally greater sclerenchymatous layers while A.
laxiusculum, A. heratense and A. squarrosum have
rectangular epidermal cells with entire walls,
eglandular hairs, radial chain pore or radial chain pore
with cluster elements and dorsi-ventral arrangement in
leaf mesophyll. Acanthophyllum borsczowii with
vertical stem, ovate-lanceolate leaves, anomocytic
stomata, polygonal epidermal cells, solitary xylem
element arrangement and rectangular stem cross section
was different from all examined species in this genus.
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