ORIGINAL_ARTICLE
Studies on the Vegetation and Soil Seed Bank in Western Saudi Arabia. 2. East of Jeddah
Seed bank dynamics and vegetation analysis were undertaken in the eastern outskirts of Jeddah town. Sevenplant communities are recorded namely Lasiurus scindicus, Calotropis procera, Blyttia fruticulosum, Cappparisdecidua, Panicum turgidum, Suaeda monoica-Tamarix aphylla and Zygophyllum simplex community. Eightyeight species of vascular plants are recorded.The study included also the evaluation of seed buried in the soil (seed bank). Relations betweencommunities and their habitat types as well as the seed bank dynamics in the area are briefly discussed.
https://taec.journals.ekb.eg/article_12473_747bbd37ef02c90eb026d1e9ee00cc75.pdf
2000-12-01
1
15
10.21608/taec.2000.12473
soil seed bank
Vegetation
Western Saudi Arabia
Kamal
Zayed
1
Botany Department, Faculty of Science, Cairo University, Giza 12613, Egypt.
LEAD_AUTHOR
Zeinab
El Karemy
aafyed65@yahoo.com
2
Botany Department, Faculty of Science, Assiut University, Assiut, Egypt.
AUTHOR
ORIGINAL_ARTICLE
Tamaricaceae in the flora of Egypt.
A taxonomic revision of the family Tamaricaceae in Egypt is presented. Twelve species belonging to two generaare reported among which Tamarix chinensis Lour. is a cultivated species.Key to the genera, sections and species based on macroscopical and microscopical characters isgiven. Representative specimens as well as geographical distribution and habitat for each species are alsoprovided. Tamarix nilotica var. arabica (Bunge) H. Hosni is a new combination while Tamarix arborea (Sieb.ex Ehrenb.) Bunge and T. mannifera (Ehrenb.) Bunge are treated as distinct species.
https://taec.journals.ekb.eg/article_12474_f46399534bb88dd95e65605cac10a325.pdf
2000-12-01
17
31
10.21608/taec.2000.12474
Egypt
Tamarix
Reaumuria
Hasnaa
Hosni
1
The Herbarium, Faculty of Science, Cairo University, Giza – 12613, Egypt.
LEAD_AUTHOR
ORIGINAL_ARTICLE
The morphology and anatomy of the achene in certain species of sub-family Ranunculoideae (Ranunculaceae) with special reference to the achene vasculature
The achene in 17 species of the sub-family Ranunculoideae (Ranunculaceae) was morphologically andanatomically studied to show the variation patterns of these two parameters. The surface of the achene and theappearance of the style whether normal and plumose or in the form of a beak were found to be delimitrate to thetaxa studied. SEM investigation of the pericarp showed that six types of surface sculpture were recorded and thereticulate type was sub-divided into six sub-types. Stress was laid upon the achene vasculature for suggesting aphylogenetic status for the studied taxa. It was concluded that less advanced taxa are those having increasednumber of vascular bundles (8-12 bundles). Intermediate taxa are those with three vascular bundles; one dorsaland two distinct ventral bundles. More advanced taxa are those with one dorsal and two fused ventral bundles.
https://taec.journals.ekb.eg/article_12475_c108317cd0dd3de0fa92a053b920b68b.pdf
2000-12-01
33
49
10.21608/taec.2000.12475
Achene anatomy
achene morphology
Ranunculoideae (Ranunculaceae)
Magdy
Mourad
1
Botany department, faculty of Science Ain Shams University, Cairo - Egypt
AUTHOR
Karima
Hamed
karimahamed@hotmail.com
2
Botany department, Faculty of Science Ain Shams University, Cairo – Egypt
AUTHOR
Abd El-Salam
Al- Nowaihi
abdelsalamalnowaihi@hotmail.com
3
Botany Department, Faculty of Science, Ain Shams University, Cairo-Egypt.
LEAD_AUTHOR
ORIGINAL_ARTICLE
Flowering and Fruiting Eco-physiology of Calotropis procera (Ait.) W.T. Ait., and importance of Gas in Fruit dehiscence.
The phenology and ecology of flowers, fruits and mechanism of fruit dehiscence have been studied.Usher Calotropis procera produces flowers throughout the year with a peak in the early dry season(summer). The number of flowers was very high reaching of 959 flowers/tree, while the production of fruits wasvery low (22 fruit/tree). Each seed is covered at one tapered end by parachute-like silky hairs of about 3.16 ±0.4cm. in length. It is possible to use the seed hairs as source for natural fibers in arid and semiarid regions. Fruitsare dehiscent by gas pressure (140.75±24.4 mm Hg). It was found that the gas occupies about 70% of wholevolume of fruit. The gas content (N2 & O2) expands with increased temperature causing a pressure on thepericarp and leading to fruit dehiscence.
https://taec.journals.ekb.eg/article_12476_7378d6b9983aabe0599c8d330ac672b3.pdf
2000-12-01
69
80
10.21608/taec.2000.12476
Calotropis procera
dehiscence
flowering
fruiting
Hasan
El-Tantawy
1
Botany Department, Faculty of Sicence, Menoufia University Shebin El-Kom, Egypt
LEAD_AUTHOR
ORIGINAL_ARTICLE
Response of Vegetation and Soil Seed Bank to Habitat Diversity in Riyadh desert, Central Saudi Arabia
Four ecologically different habitats within Riyadh desert (Central Saudi Arabia) were studied. Three differentplant communities dominated by Pulicaria crispa, Lycium shawii and Farsetia aegyptia form the vegetationunits inhabiting the first habitat represented by depressions and wadi terraces with deep and finely textured soil.The seed content in the upper 2 cm of these soils ranged between 38304 and 71484 seeds/m2. The second habitatis represented by the runnels dissecting gravelly areas with shallow and coarse-textured soil. This habitatsupported the growth of two plant communities dominated by perennial grassland species Cenchrus ciliaris andLasiurus scindicus with soil seed content amounting to 14855 and 9000 seeds/m2 in the two communitiesrespectively. Sandy plains represent the third investigated habitat which is inhabited by Rhazya strictacommunity with soil seed content amounting to 41580 seeds/m2. Saline soils supporting growth of thecommunities dominated by salt tolerant species Tamarix nilotica and Zygophyllum album formed the fourthinvestigated habitat. The counted seeds in the upper 2 cm of the soil were 53352 and 15624 seeds/m2 in theabove communities, respectively. The present study showed that the emerged seedlings from the soils collectedfrom the recognized communities represented a low value ranged from 0.92 to 3.38% out of the total estimatedseed bank.
https://taec.journals.ekb.eg/article_12477_a9eb1e0bae961fc349e3ea39ec99deb3.pdf
2000-12-01
81
94
10.21608/taec.2000.12477
soil seed bank
Riyadh desert
Kamal
Zayed
1
Botany Departmen, Faculty of Science, Cairo University, Giza, Egypt.
LEAD_AUTHOR
ORIGINAL_ARTICLE
SEM of seed coat surface and SDS-PAGE of seed protein criteria in certain taxa of the Primulaceae
SEM of seed coat surface and SDS-PAGE of seed protein criteria were used to re-assess the taxonomicrelationships between 12 species belonging to three genera of Primulaceae, viz. Cyclamen L. (one species),Lysimachia L. (six species) and Primula L. (five species). The data obtained, in addition to other charactersavailable in the literature, were analyzed by the NTSYS-pc. Program package using the UPGMA clusteringmethod. A considerable divergence was evident between Cyclamen and each of Lysimachia and Primula. Aclose relationship was recorded between each of Lysimachia lichiangensis Thunb. & L. verticillata Bieb; L.ephemerum (Gray) Hbd.& L. punctata L.; Primula burmanica Fern.& P. japonica Gray; Primula elatior (L.)Hill & P. veris L. The variations in SDS-PAGE of seed protein profiles were compatible to some extent with themorphological variations exhibited in these taxa. The validity of using the seed coat microsculpture and seedprotein electrophoretic criteria as taxonomic evidence in the Primulaceae was referred to.
https://taec.journals.ekb.eg/article_12478_056cbf6547d6390812b5f05be068105e.pdf
2000-12-01
95
111
10.21608/taec.2000.12478
Cyclamen – Lysimachia – Primula – Primulaceae- SDS-PAGE
SEM
Abed-El-Moniem
Aboel-Atta
1
Biological Sciences and Geology Department, Faculty of Education, Ain Shams University, Roxy (Heliopolis), P.C.11341, Cairo, Egypt.
LEAD_AUTHOR
Maged
Abou-El-Enain
magedabouelenain@gmail.com
2
Biological Sciences and Geology Department, Faculty of Education, Ain Shams University, Roxy (Heliopolis), P.C.11341, Cairo, Egypt.
AUTHOR
Mohamed
Loutfy
3
Biological Sciences and Geology Department, Faculty of Education, Ain Shams University, Roxy (Heliopolis), P.C.11341, Cairo, Egypt.
AUTHOR
ORIGINAL_ARTICLE
Bryophytes of the United Arab Emirates (UAE)
Interest in bryophytes of the United Arab Emirates (UAE) is relatively quiterecent and, hitherto, only four works (Long, 1987; Frey & Kürschner, 1988; Kürschner &Böer, 1999; Shabbara & El-Saadawi, 1999) pertaining to the bryoflora of that part of theArabian Peninsula (Fig. 1) have appeared.Only one hepatic was reported in the work of Long (1987) while in the work ofFrey & Kürschner (1988) a second hepatic and three mosses have been reported. In 1999Kürschner & Böer added five hepatics and 12 mosses which raised the total number ofbryophytes known from UAE to 22 taxa (seven hepatics and 15 mosses). Shabbara andEl-Saadawi (1999), further added one new hepatic and 24 new mosses; however five ofthese mosses were among those reported by Kürschner and Böer in the same year. Thismakes the total now known from UAE as 42 taxa (eight hepatics and 34 mosses).This represents a relatively good contribution to the bryoflora of that area of theArabian Peninsula which was, till quite recently, almost unknown bryofloristically.Names of all the reported taxa and details about their distribution and floristicrelationships will soon be published
https://taec.journals.ekb.eg/article_12479_3b4e85858253b9948e234be14bc2264b.pdf
2000-12-01
113
114
10.21608/taec.2000.12479
Wagieh
El- Saadawi
elsaadawy@link.com.eg
1
Botany Department, Faculty of Science, Ain Shams University, Cairo, Egypt.
LEAD_AUTHOR
Hanaa
Shabbara
2
Botany Department, Faculty of Science, Ain Shams University. Cairo-Egypt.
AUTHOR