Egypt. J. Bot. Vol. 59, No. 2, pp. -
1254
(2019)
Auto-taxonomy of Brassica nigra (L.) Koch (Brassicaceae) in Egypt
Wafaa Amer(1), Mahmoud Shoulkamy(2), Ahmed Faried(3) and Hadeer Abd ElBaset(2)#
(1)
Botany and Microbiology Department, Faculty of Science, Cairo University, Giza,
Egypt; (2)Botany and Microbiology Department, Faculty of Science, Minya University,
Minya, Egypt; (3)Botany and Microbiology Department, Faculty of Science, Assiut
University, Assiut, Egypt.
B
RASSICA L. is one of the most economically important genera within family Brassicaceae,
it includes approximately 80 species worldwide. In Egypt, the genus represented by five
species. Among them, Brassica nigra (L.) Koch, which grown as a weed in field crops as
well as roadsides of Mediterranean region. The field and herbarium observations reflected the
notable morphological diversity within the species populations. Accordingly, morphological
and palynological studies for the different geographical populations of Brassica nigra were
carried out to trace the species diversity and helps for identification the infra-species taxa. The
taxonomic revision of the species in Egypt, was carried out on the herbarium specimens as
well as fresh materials represented by 26 populations, distributed along the Nile Valley and the
Nile Delta. The results revealed the presence of two varieties namely var. bracteolata and var.
nigra. The fruit peak and trichomes are the differential characters delimiting the two varieties.
Moreover, the results showed also presence of var. nigra in two different biotypes. SEM of the
seed coat and pollen grains showed the presence of notable infra-specific diversity. For pollen
grains, the size, apertures and exine ornamentation confirming this diversity. Photographs and
taxonomic key for varieties and forms will be addressed.
Keywords: Biotypes, Brassica, Egyptian Flora, Forms, var. bracteolata, var. nigra, SEM,
Pollen grains.
Introduction
Brassicaceae (Cruciferae) is a monophyletic
group, which currently includes approximately
3709 species and 338 genera (Al-Shehbaz et al.,
2006). It is one of the most agronomical important
plant families, it includes vegetables, ornamental
and crop species (Kasem et al., 2011). Nearly
all members of this family are Mediterranean,
Irano-Turanian and Saharo-Sindian zones except
Antarctica region (Hedge, 1976 and Lysak &
Koch, 2011). Genus Brassicais one of the most
agriculturally important genera of Brassicaceae
family, it includes about 80 accepted species
worldwide,with high morphological diversity and
wide-ranging utility (Song et al., 1988 and The
Plant List, 2013).
In Egypt, Brassicaceae is one of the four
largest families, represented by about 103 species
and 53 genera (Boulos, 1999). It showed the
presence of high degree of phenotypic variations
#
with and within populations. Taxonomic structure
of the whole family is characterized by a large
number of monotypic and small genera, mostly
with clearly defined taxonomic limits. Due to its
great economic importance, crops of Brassica
received the attention of taxonomists from the
earliest times (Warwick, 2011). Genus Brassica
represented in Egypt by five species, namely: B.
rapa L., B. tournefortii Goauan, B. deserti Danin
& Hedge, B.nigra (L.) Koch and B. juncea (L.)
Czernj. & Coss.
Brassica nigra is an annual herbaceous plant
that originated in the Middle East, its seed has
long been used in central and southern Europe,
North Africa and Asia for cooking oil and
medicine (Tsunoda, 1980 and Vaughan, 1977).
Now it is widely cultivated as a primary source of
the mustard seeds used in making the condiment
sauce, table mustard, and others. Brassica nigra
is known to exhibit considerable morphological
variations: It has been divided taxonomically into
Corresponding author email: hadeer_dahy@yahoo.com
DOI: 10.21608/ejbo.2019.6375.1254
Edited by: Prof. Dr. Fawzy M. Salama, Faculty of Science, Assuit University, Assuit, Egypt.
©2019 National Information and Documentation Center (NIDOC)
2
WAFAA AMER et al.
varieties. The morphological diversity of B. nigra
in Egypt still unresolved issue where, Täckholm
(1974) reported the occurrence of three varieties
belonging to B. nigra, namely v. brcteolata (Fisch.
& Mey.) Spach,v. torulosa Alef. and v. turgida
Alef. Later, Boulos (1999, 2009) considered these
varieties as synonyms to B. nigra (L.) Koch.
Although pollen morphologyis useful in
the separation of closely related genera within
angiosperm families (Rollins, 1979 and AlShehbaz, 1989), most members of Brassicaceae
are considered to be stenopalynous with a uniform
pollen shape (Al-Shehbaz et al., 2006 and Erdtman,
1972). However, numerous studies (e.g. Erdtman,
1972; Jonsell, 1979; Rollins & Banerjee, 1979;
Lahham & Al-Eisawi, 1987 and Anchev & Deneva,
1997) have demonstrated that pollen characters
were useful for assessing phenetic relationships
and resolving taxonomic problems within different
taxa of Brassicaceae.
Seed coat ultrastructural pattern using SEM
are very significant for assessing phenotypic
relationships and resolving taxonomic problems
(Kasem et al., 2011 and Heywood, 1971).
The importance of seed coat sculpturing in
discrimination and identification of Brassica was
performed by numerous taxonomists (among them:
Musil, 1948; Berggren, 1962; Mulligan & Bailey,
1976; Stork et al., 1980; Buth & Roshan, 1983;
Fayed & El Naggar, 1988; Setia et al., 1989; Ren
& Bewley, 1998; Koul et al., 2000 and Kasem et
al., 2011).
However, little is known about the extent and
distribution of genetic variation in B. nigra in
Egypt. Brassica nigra is reported to have little
morphological variation compared with the major
Brassica crops (Prakash & Hinata, 1980).
Therefore, in this study we aimed to study
the morphological and palynological and seed
sculpture traits of different populations of Brassica
nigra representing its geographic range in Egypt
to provide detailed information about the species
diversity and for identification of the infra-species
taxa (species auto-taxonomy).
Materials and Methods
Morphological data of Brassica nigra were
achieved by examination of fresh specimens
belonging to 26 populations collected from
Egypt. J. Bot. 59, No.2 (2019)
different geographical regions during flowering
and fruiting seasons. Localities of the sampled
populations are given in Table 1 and mapped in Fig.
1. However, the floras mentioned that the species
traced in Mediterranean region (Boulos 2009),
the last specimens deposited in Cairo University
Herbarium dated back to 1964 and no specimens
were traced in the field trips.
Fresh samples were collected and directly
fixed in FAA fixative (50ml ethyl alcohol, 10ml
formaldehyde, 5ml glacial acetic acid, and 35ml
distilled water) and voucher samples were dried
and deposited in herbaria of both of Assiut (ASTU)
and Minya Universities.
All the distribution localities were studied
for morphological diversity using different
morphological criteria of stem, leaves,
inflorescence and fruit characters (Table 2). Stem,
leaves and fruits were examined and photographed
by Olympus SZ61 stereomicroscope provided with
a digital Olympus camera SC100.
Sample preparation for SEM
For pollen SEM study, representative
population from each variety and biotype was
chosen. Fresh anthers were collected from floral
buds and photographed by Scanning Electron
Microscope (SEM) using Joel 1200 EXІІSEMat
20KV. Measurements of size, polar axis, equatorial
axis and colpus length and width were recorded in
Table 3.
For seed sculpture, representative clean, full
ripened seeds were selected in triplicate and fixed
on aluminium stumb using double stick adhesive
and then coated and photographed using Joel 1200
EX ІІ SEM at 20KV. The terminology of Punt
et al. (1994) and Koul et al. (2000) are used for
describing the pollen morphological characters as
well as seed coat sculpturing, respectively.
Results
Species morphology
Brassica nigra (L.) Koch, is annual herb 0.4–1.5
(2)m, glabrous to sparingly hispid with stiff hairs.
Stem erect branched from upper and lower parts.
The radicle leaves lyrate- pinnatisect (in different
forms), up to 75cm long, petiolate serrate–double
serrate margin. Cauline leaves ovate with 18–
20×2.0–2.5cm and serrate margin. Inflorescence
richly branched. Flowers, with yellow, claw-shaped
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AUTO-TAXONOMY OF BRASSICA NIGRA (L.) KOCH (BRASSICACEAE) IN EGYPT.
petals and 6 stamens (tetradynamous). Fruit siliqua
up to 40mm length, its peak ranges from 1/4 to 1/2
of the fruit length. Seeds numerous, globose, dark
brown, 0.2mm in diameter.
Infra-specific diversity
Based on macromorphological traits
The present study carried out on 26 Brassica
nigra populations in addition to the herbarium
specimens deposited in Cairo, Assiut and Minya
herbaria. 50 morphological traits are used to
revealthe infra specific diversity in the studied
populations grouped these populations under two
varieties.
The radical leaves showed clear variations in
size (up to 75cm in var. nigra and up to 50cm in
var. bracteolata) as shown in Table 2. The leaf at
the species level is lyrate, with pinnatisect lobes
(Fig. 2). Terminal lobe in var. bracteolata is broad
ovate with clear basal collar lobes not-reached
to the midrib (Fig. 2 C), where this basal collar
lobes reach to the midrib in var. nigra (Fig. 2 A
and B). Moreover, var. nigra showed triangular
terminal lobe in form 1 and elliptical in form 2,
the both forms provided with irregular serratedentate margin, while var. bracteolata showed
clear dentate margin.
The siliqua fruit ranges from up to 35mm in
var. nigra to up to 40mm in var. bracteolata (Table
2). The later also distinguished by its longer fruit
peak which extended to half of the fruit length.
The taxonomic study of the studied Brassica
nigra populations using 50 morphological
characters outlined in Table 2 showed the
presence of high degree of phenotypic variations
among the studied 26 populations and revealed
the presences of distinct three infraspecific taxa
namely var. bracteolata, var. nigra form 1and var.
nigra form 2.
TABLE 1. The phyto-geographical locations of the studied Brassica nigra populations.
St. No.
Localities
GPS coordinates
N
E
27° 34’ 3.348”
30° 48’ 7.085”
27° 2721.438”
30° 49’ 24.584”
27° 24’ 22.361”
30° 52’ 10.707”
27° 21’ 32.429”
30° 54’ 59.543”
27° 925.341”
31° 12’ 40.289”
27° 4’ 20.880”
31° 15’ 10.959”
27° 2’35.92”
31°17’45.25”
27° 0’ 19.712”
31° 20’ 26.911”
26° 53’ 41.863”
31° 26’ 33.989”
26° 49’ 11.029”
31° 30’ 9.114”
26° 46’ 32.078”
31° 31’ 3.658”
26° 44’ 8.908”
31° 33’ 7.876”
26° 41’ 4.925”
31° 36’ 44.159”
28° 17’ 35.856”
30° 42’ 55.315”
28° 19’ 40.130”
30° 42’ 9.552”
28° 23’ 58.125”
30° 46’ 14.230”
28° 30’ 57.945”
30° 47’ 31.618”
28° 36’ 14.588”
30° 48’ 46.146”
28°37’38.189”
30°49’8.758”
28° 1’ 48.513”
30° 48’ 1.002”
27° 52’ 3.226”
30° 48’ 0.528”
27° 46’ 55.051”
30° 50’ 28.675”
Associated field
11
12
13
14
15
16
17
18
19
20
21
22
23
1
2
3
4
5
6
7
8
9
Dirout – Assuit
South to Qousia – Assuit
Bani Zeid , Qousia – Assuit
Bani Rafea , Manflout – Assuit
Abo teeg – Assuit
5 Km to Assuit
El Mouteaa – Sohag
Sedfa – Sohag
Tma – Sohag
Shatora – Sohag
Tehta – Sohag
Banawit – Sohag
El Maragha – Sohag
5 Km to Samalot - Minya
Samalot – Minya
Matai – Minya
El Gharabawi – Minya
Dahrout – Minya
Maghagha – Minya
El Howslia – Minya
Abo Qorkas – Minya
Malawy – Minya
Alfalfa
Wheat
Alfalfa
Alfalfa
Alfalfa
Alfalfa
Alfalfa
Cabbage
Wheat
Alfalfa
Wheat
Wheat
Wheat
Alfalfa
Alfalfa
Lentil
Alfalfa
Alfalfa
Alfalfa
Wheat
Wheat
Wheat
10
Dermawas – Minya
27° 37’ 12.988”
30° 50’ 40.104”
Wheat
24
25
26
Beni Suef
El Giza
Ashmoon – al-Minufiyah
29° 04’ 22.45”
30°18’ 33.14
30°12’ 39”
31° 05’ 27.33
31°10’ 91.44
30° 57’ 23”
Wheat
Wheat
Wheat
Egypt. J. Bot. 59, No.2 (2019)
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Egypt. J. Bot. 59, No.2 (2019)
WAFAA AMER et al.
Fig. 1. Distribution map of Brassica nigra in Egypt.
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AUTO-TAXONOMY OF BRASSICA NIGRA (L.) KOCH (BRASSICACEAE) IN EGYPT.
TABLE 2. Morphological features of the studied Brassica nigra taxa.
Characters
var. nigra form 1
var. nigra form 2
var. bracteolata
Hairy all over
Pinnatisect
Irregularly serrate-dentate
Petiolate
Up to 75cm
Oblong ovate
Kidney shape stomata
Acute
3–7 lobes
1.5–5cm
Midrib only
Pinnatisect
Irregularly serrate-dentate
Petiolate
Up to 30cm
Oblong ovate
Kidney shape stomata
Acute
2–5 lobes
2–5cm
Glabrous
Pinnatisect
Irregularly dentate
Petiolate
Up to 50cm
Oblong ovate
Kidney shape stomata
Obtuse
2–6 lobes
1.5–4cm
Serrate denticulate
Petiolate
1–4 lobes
Denticulate
Petiolate
1–2 lobes
Denticulate
Petiolate
1–3 lobes
Up to 2.5×20
Up to 1.5×15
Up to 2×18
Ovate
Acute
Ovate
Acute
Ovate
Acute
4-7×0.5-1.5
Linear
Glabrous
3
Obtuse
Entire
5-6×1-1.5
Linear
Glabrous
3
Obtuse
Entire
4-6×0.5-1.5
Linear
Glabrous
3
Acute
Entire
9-14×3-5.5
L of claw 3-5
L of blade 6-9
9-12×4-6
L of claw 3-5
L of blade 6-9
9-11×4-6
L of claw 3-5
L of blade 5-7
Basal (radical) leaf:
1-Hairs
2-Shape
3-Margin
4-Petiole
5-Length
6-Shape
7-Stomata
8-Apex
9-Segmentation
10-Width of the upper lobe
Upper (cauline) Leaf:
11-Margin
12-Petiole
13-Segmentation
14-Upper lobe:
L ×Wcm
15-Shape
16-Apex
Flower:
Sepals:
17-(L×W)mm
18-Shape
19-Surface
20-No. of main veins
21-Apex
22-Margin
Petals: (divided into claw and blade)
23-(L×W)mm
24-Shape of claw
Filiform
Filiform
Filiform
25-Surface
Glabrous
Glabrous
Glabrous
5-7
Obtuse
Entire
5-9
Obtuse
Entire
5-9
Obtuse
Entire
5-7×0.3-0.5
Linear
Glabrous
4-7×0.3-0.5
Linear
Glabrous
5-7×0.2-0.5
Linear
Glabrous
1.5-3×0.5-1
Oblong
Normal
Obtuse
Capitate bi-lobed
1.5-3×0.5-1
Oblong
Normal
Obtuse
Capitate bi-lobed
1.5-2×0.5
Oblong
Normal
Obtuse
Capitate bi-lobed
26-No. of main veins
27-Apex
28-Margin
Stamens: 6 (2+4)
Filaments:
29-L×Wmm
30-Shape
31-Surface
Anthers:
32-L×Wmm
33-Shape
34-Base of attachment
35-Apex
36- Stigma
Egypt. J. Bot. 59, No.2 (2019)
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WAFAA AMER et al.
TABLE 2. Cont.
Characters
Pedicle:
37-Length
Flower bract:
38-Hairs
39-Vennation
40-Margin
41-Apex
42-Shape
43-Length
Fruit:
44-Length of the whole fruit
45-Length of the fruiting part
46-Length of peak
47-Ratio (Fp/Flp)
48-Number of seeds/ fruit
49-Surface
50-Shape of receptacle
var. nigra form 1
var. nigra form 2
var. bracteolata
Up to 10mm
Up to 7mm
Up to 15mm
Hairy
Pinnate reticulate
Dentate
Acute
Ovate
Up to 3.5cm
Glabrous
Pinnate reticulate
Dentate
Acute
Ovate
Up to 3cm
Glabrous
Pinnate reticulate
Almost entire
Acute
Obovate
Up to 3cm
Up to 35mm
Up to 20mm
Up to 15mm
10–25
6-12
Glabrous
Flat
Up to 35mm
Up to 22mm
Up to 15mm
27-50
8-12
Glabrous
Flat
Up to 40mm
Up to 35mm
Up to 12mm
(7:1) – (4:1)
8-20
Glabrous
Flat
TABLE 3. Pollen features of the studied B.nigra taxa, ( ): mean value.
Characters
Pollen Shape
Pollen aperature
Pollen sculpture
Endexine sculpture
Muri-wall
Muri-pattern
Polar Axis (P)µm
Equatorial Axis (E)µm
P/E (µm)
Colpus length (L)
var. nigra
Form 1
Form 2
Oblate
Suboblate
Tricolpate
Tricolpate
Reticulate
Reticulate
Sparsely-warty
Densely warty
Warty
Sparsely warty
Regular-heterobronchate
Regular-heterobronchate
20.50–21.0
25.50–26.20
(20.75)
(25.85)
40.50–41.50
30.90–31.70
(41.0)
(31.30)
0.506
0.825
35.70
21.40
var. bracteolata
Oblate
Tricolpate
Reticulate
Smooth
warty
irregular-heterobronchate
19.20–20.0
(19.60)
29.20–30.70
(29.95)
0.654
26.35
Fig. 2. Radical leaves diversity in Brassica nigra, A: var. nigra form 1 , B: var. nigra form 2 and C: var. bracteolata .
Egypt. J. Bot. 59, No.2 (2019)
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AUTO-TAXONOMY OF BRASSICA NIGRA (L.) KOCH (BRASSICACEAE) IN EGYPT.
The taxonomic differentiation was based
on the 50 morphological characters including
features of basal leaves, cauline leaves,
inflorescence as well as fruit characters, seeds
and flower structure (Table 2), claimed the
following differential key:
Key
1 -Leaves glabrous, fruit peak up to 1/4 fruit
length …..….............… var. bracteolata
-Leaves hairy, fruit peak up to 1/2 fruit length
………..................…………...........(2)
2 -Basal leaves up to 30 cm, hairs on all over the
surface .…............................ var. nigra form 1
-Basalleaves up to 75cm, hairs found only on
mid rips of leaf lower surface................. var.
nigra form 2
Based on micromorphological traits using SEM
Stem
Scanning of the stem epidermal system
in the studied B. nigra represented in Fig. 3.
This figure reflecting a clear striate epidermal
sculpture in var. nigra (Fig. 3 A and B) and
incontinuous ridges in var. bracteolata (Fig. 3
C), the later also characterized by high density
of verrucate cuticular deposits of varying –size,
where it appears uniform and sparse in var.
nigra as outlined in Fig. 3 A.
Leaf
The scanning of the leaf upper surface outlined
in Fig. 4, confirming the distinctive differential
micromorphological characters. Among them the
presence of abundant stomata on the same level in
epidermal cells in var. nigra form 1 (Fig. 4 A) and
it appeared on raised ridges in var. nigra form 2
(Fig. 4 B). On the other hand, stomata in case of
var. bracteolata appeared sparse and in lower level
than epidermal cells. Moreover, var. bracteolata,
this variety characterized by abundant verrucate–
shaped cuticular deposits, which appeared sparse
in var. nigra (Fig. 4 C).
Seed coat
The micromorphological features of the
seed coat of the studied B. nigra populations as
seen by SEM showed common reticulate seed
coat pattern (Fig. 5). Notable infra-specific
variations noticed in the periclinal wall; as
it appears elevated wavy and folded in var.
nigra form 1, elevated and straight in form 2,
while it is grooved in var. bracteolata (Figs.
5 A, B & C). The anticlinal surface is straight
with faint papillae in form 1, straight, striate
in form 2 and papillate in var. bracteolata
(Fig. 5 A, B & C).
Pollen grains
The SEM of the studied Brassica taxa
showed that the pollen grains are radially
symmetric, isopolar, with oblate-suboblate
shapes. Apertures are tricolpate with syncolpi
in both form 1 and 2 while in var. bracteolata
the pollens have narrow apocolpi. Evine surface
is widely reticulate in forms 1 and 2, while it is
narrowly reticulate in var. bracteolate (Fig. 6
A, B & C). The measurements and descriptions
based on 30 pollen samples are summarized in
Table 3.
Fig. 3. Stem sculpture in Brassica nigra; A, B: var. nigra (A: form 1 and B: form 2) and C: var. bracteolata.
Egypt. J. Bot. 59, No.2 (2019)
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WAFAA AMER et al.
I
II
Fig. 4. Leaf surface sculpture of B. nigra using SEM; I- Stomata pattern, II- Magnified part. A and B: var. nigra
with notable stomata and sparse cuticular deposits (A: form 1 and B: form 2) and C: var. bracteolata, with
sparse stomata and dense cuticular deposits.
Fig. 5. Seed coat sculpture of B. nigra A & B: var. nigra (A: form 1, with elevated wavy-folded periclinal walls &
B: form 2, with elevated-straight periclinal walls) and C: var. bracteolata , with grooved periclinal walls.
Egypt. J. Bot. 59, No.2 (2019)
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AUTO-TAXONOMY OF BRASSICA NIGRA (L.) KOCH (BRASSICACEAE) IN EGYPT.
Size: The pollen grain diameter of the studied
B. nigra taxa ranges from 29.95–41µm (Table 3),
var. bracteolata is the smallest (P×E: 19.6 × 29.95),
as showed in Table 3 and Fig. 6 C.
Shape: The pollen according to P/E ratio (Table
3), distinguished two types oblate shape (P/E: 0.50.75) in var. bracteolata and var. nigra form 1.
While form 2 is suboblate (P/E: 0.76–0.88).
Pollen apertures: Tricolpate pollen in B. nigra
with shortest colpus (21.40µm) in var. nigra form
2 and the largest (35.70µm) in var. nigra form 1,
while var. bracteolata was intermediate in colpus
length (Fig. 6).
Exine sculpture: It is reticular, with regular
heterobronchate muri-pattern in var. nigra (Fig.
6 A & B), to irregular heterobronchate in var.
bracteolata (Fig. 6 C). While, the endexine
sculpture appeared warty in var. nigra and being
smooth in var. bracteolata (Fig. 6).
Discussion
The taxonomic identity of the B. nigra (L.) Koch
at the infraspecific level was subjected to debates
long time ago since 1966 (Zohary & FeinbrunDothan, 1966), who classified B. nigra (L.) Koch
into two varieties var. bracteolata (Fisch. & Mey.)
Spach ex cross. and var. nigra, based mainly on the
presence of epidermal trichomes and the length of
fruit peak.
In flora of Egypt, Täckholm (1974) mentioned
the presence of B. nigra in three varieties namely
var. bracteolata (Fisch. & Mey.) Spach ex Cross.,
var. torulosa (Pers.) Alef. and var. turgida(Pers.)
Alef. Later, all these infra-specific taxa were
grouped as synonyms for B. nigra species by
Bolous (1999 and 2009). Worldwide, the “Plant
list” and the “IUCN Red List” (Korpelainen et al.,
2011), also grouped all the infra-specific taxa as
synonyms to the species.
In Egypt, the earlier works were at the flora and
not in taxonomic levels, and no detailed taxonomic
study was carried out at the infra-specific level,
in addition to the notable morphological diversity
observed during field trips and herbarium
specimens, which enhance authors to carry the
species auto-taxonomy. The study based on
50 macro-morphological characters (Table 2),
revealed the presence of two distinctive varieties,
var. bracteolata with glabrous plant surface and
fruit peak not exceeding the quarter of the fruit
length and var. nigra with trichomes and fruit peak
extended to half of the whole fruit, in addition to
the rest of the 50 characters outlined in Table 2
and Fig. 2, which outlined the notable variation in
the terminal lobe of the basal leaf between the two
varieties. This achieved classification is supported
by the earlier grouping by Zohary & FeinbrunDothan (1966).
Fig. 6. Pollen grains with reticulate-heterobronchate sculpture of the studied B. nigra (A & B: var. nigra with wide,
regular muri-pattern and C: var. bracteolata, with narrow irregular muri-pattern).
Egypt. J. Bot. 59, No.2 (2019)
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WAFAA AMER et al.
The identified varieties (var. nigra and var.
bracteolata) showing no distinctive geographical
distribution (Fig. 1 and Table 1) for each variety,
both are co-distributed sometimes in mixed
populations along the cultivated area in Nile Delta
and Nile valley, this is an evidence for the absence
of the environmental influence in the varieties
distribution within the Egyptian borders.
The retrieved micromorphological traits using
SEM on stem (Fig. 3) and leaf (Fig. 4) showed
distinctive differences between the studies 26 B.
nigra populations, confirming grouping of them
into two varieties. However, this grouping is not
supported earlier by Boulos (1999 and 2009) and
Korpelainen et al. (2011), works in which these
varities treated as synonyms to B. nigra.
The data retrieved from seed coat (Fig. 4),
confirming our grouping of B. nigra into two
varities, and the observed variations supported the
potential use of seed coat pattern as a parameter
for grouping to varity level. The underspecific
variations in seed coat was supported by Song et
al. (1988), Delseny et al. (1990), Prakash & Hinata
(1980) and Koul et al. (2000), who reported a wide
range of morphotypes in diploid Brassicaceae
species, in which, Brassica nigra among them.
The pollen grains of B. nigra possess reticulate,
tricolpate type (Fig. 6), this reported by Abdel
Khalek et al. (2002). The observed pattern regular
heterobronchate in var. nigra and irregular
heterobronchate in var. bracteolata, also the warty
endexine in var. nigra compared to the smooth
one in var. bracteolata (Table 3 and Fig. 6). These
variations can give a phylogenetic point of view
that B. nigra is more primitive than B. bracteolate.
This phylogenetic opinion can be supported by
the syncolpate aperture in the former versus the
noticeable apocolpi in the later. The seed coat
characters and the macromorphological characters
of both stem and leaves confirming the presence
of two distinct varieties for B. nigra in Egypt. The
high taxonomic significance of pollen morphology
at the infra-specific level was confirmed earlier by
Amer & Abdo (2014).
Conclusion
Finally, we conclude that the autotaxonomy of B.
nigra in Egypt based on the macro- and micromorphological characters confirming the presence
of two distinctive varieties var. nigra and var.
Egypt. J. Bot. 59, No.2 (2019)
bracteolata with a trend in phylogeny within
them and these two varieties should adopted
taxonomically.
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12
WAFAA AMER et al.
التصنيف الذاتي للمسترده السوداء (الفصيلة الصليبية) في مصر
)(2
وفاء عامر) ،(1محمود شلقامي ) ،(2أحمد فريد ) ،(3هدير عبد الباسط
) (1قسم النبات والميكروبيولوجي كلية العلوم – جامعة القاهرة – الجيزة – مصر(2) ،قسم النبات والميكروبيولوجي
كلية العلوم – جامعة المنيا – المنيا – مصر (3)،قسم النبات والميكروبيولوجي كلية العلوم – جامعة أسيوط –
أسيوط – مصر.
جنس المسترده هو أحد أهم األجناس األقتصادية في الفصيلة الصليبية ،ويحتوي علي ما يقرب من 80نوع
علي مستوى العالم .والمسترده السوداء هو أحد هذه األنواع وينمو بريا في حقول المحاصيل والطرق في منطقة
المتوسط .وقد أثبتت المالحظات الحقلية والمعشبية لتجمعات المسترده السوداء تنوع ملحوظ في الشكل الظاهري.
ومن هنا كان لزاما ً إجراء دراسة تشمل الشكل الظاهري وحبوب اللقاح للتجمعات المختلفة بالمناطق الجغرافية
المختلفة لهذا النوع للتعرف علي الوضع التصنيفي للوحدات تحت هذا النوع.
وقد شملت الدراسة العينات المعشبية و 26تجمع للنبات موزعة على طول وادي النيل والدلتا .وأثبتت
الدراسة وجود صنفان األول بركتيوالتا والثاني نجرا ,وقد ميزهما صفات الثمرة والشعيرات .كما أوضحت
المراجعة وجود صنف النجرا في نوعين بيولوجيين )بيوتيب(.
كما أثبت المسح السطحي لقصرة البذرة بالميكروسكوب الماسح اإلليكتروني ) (SEMوكذلك حبوب اللقاح
أن نوع المسترده السوداء يحتوي على وحدات تصنيفية واضحه تحت النوع وظهر هذا جليا ً من خالل حجم وشكل
وفتحات األنبات لحبوب اللقاح .وخلصت هذه الدراسة إلى وضع مفتاح تصنيفي للتمييز بين األصناف واألشكال
البيولوجية لهذا النوع )المسترده السوداء(.
)Egypt. J. Bot. 59, No.2 (2019