ArticlePDF Available

Contributions to the Pollen Morphology of Genus Astragalus L. (Fabaceae) and its Taxonomic Implications Faraj Al-Ghamadi, Ahmed Kamal El-Deen Osman and Arbi Guetat

Authors:
Ahmed Kamal El-Deen Osman Faraj Al-Ghamadi
Ahmed Kamal El-Deen Osman Faraj Al-Ghamadi
Ahmed Kamal El-Deen Osman Faraj Al-Ghamadi
  • This person is not on ResearchGate, or hasn't claimed this research yet.
Arbi Guetat at Northern Borders University
Arbi Guetat
Download full-text PDF
Read full-text
Download citation

Figures

No caption available
… 
Figures - uploaded by Arbi Guetat
Author content
All figure content in this area was uploaded by Arbi Guetat
Content may be subject to copyright.
Content uploaded by Arbi Guetat
Author content
All content in this area was uploaded by Arbi Guetat on Mar 30, 2014
Content may be subject to copyright.
(a) (b) (c)
(d) (e) (f)
(g) (h) (i)
(a) (b) (c)
(d) (e) (f)
(g) (h) (i)
(a) (b) (c)
(d) (e) (f)
(g) (h) (i)
(a) (b) (c)
(d) (e) (f)
(g) (h) (i)
(a) (b) (c)

Supplementary resource (1)

Contributions to the Pollen Morphology of Genus Astragalus L. (Fabaceae) and its Taxonomic Implications
Data
April 2014
Ahmed Kamal El-Deen Osman Faraj Al-Ghamadi · Arbi Guetat
... The researchers reported that especially exine sculpturing is significant for discriminating the taxa from each other. Also, Al-Ghamadi et al. (2013) Astragalus species they examined from Saudi Arabia. Metin et al. (2018) recorded that the ornamentation of trichomes is a distinctive character for the taxonomy of the Astragalus victoriae Podlech & Agerer-Kirchhoff and A. melanophrurius Boiss. ...
Astragalus aybarsii a new species of sect. Onobrychoidei DC. (Fabaceae) from Turkey
Article
Full-text available
  • Nov 2020
Astragalus aybarsii H. Duman & Aytaç (Fabaceae) is described and illustrated as a new species from Kastamonu province (Turkey). The new species grows in open areas of Pinus brutia Ten. forests. Diagnostic and morphological charactersof the new species are compared with its close relatives, A. setulosus Boiss. & Balansa and A. eubrychioides Boiss. Also, some notes on the ecology, biogeography, conservation status and the pollen morphological and leaflet micromorphological features of the new species are presented. The geographical distribution of this new species and its allied species is mapped.
View
... Ozler et al. (2009) and Keshavarzi et al. (2011) had suggested the same phenomenon in the genus Agropyron and Fumaria. According to Al-Ghamadi et al. (2013), the cluster analysis in thirteen species of Astragalus generated groups based on the levels of variations within and between species. In PCA of quantitative and qualitative traits, the first principal axis denoted maximum variations. ...
Palynological characterization of species of Sesamum (Pedaliaceae) from Kerala: a systematic approach
Article
Full-text available
  • May 2015
The study deals with the pollen morphological characterization of thirty-seven accessions under six species of Sesamum, including the wild and cultivated taxa, collected from the state of Kerala. The assessment of species relationship of the taxa forms the pivotal aim of the investigation. The study displayed the significance of palynological characters such as aperture type, size and shape of pollen grains and exine ornamentation in the delimitation of the taxa at inter- and intra-specific levels. The species exhibited uniformity in their aperture morphoform (stephanocolpate), though they differed in the number of apertures. Wide variations observed in the exine ornamentation such as reticulum cristatum with gemmate (S. indicum), baculate (S. radiatum, S. prostratum), verrucate (S.malabaricum), areolate (S. laciniatum) and gemmate with clavate (S. alatum) suggested the utility of the character in the systematics of the genus. Inter-specific variation noticed in the size and shape of the pollen grains ranged from medium (S. laciniatum) to large (S. radiatum and S. malabaricum) and suboblate to prolate, respectively. The study explained the evolutionary relationship of the taxa based on pollen morphology. A taxonomic key is also prepared and presented based on the characters analysed.
View
Screening of Phytochemical Constituents in Ethanolic Extract from Astragalus spinosus Roots and Assessment of Its Anticancer, Antioxidant, and Antibacterial Activities
Article
Full-text available
  • Feb 2024
The study aims to analyze the chemical components of Astragalus spinosus roots extract after the ethanolic extraction process using techniques such as gas chromatography-mass spectrometry, infrared, and UV-Vis spectroscopy to indicate the phytochemical content of the extract. The extract contained various compounds, including alkaloids, terpenoids, flavonoids, phenols, and carboxylic acids. Flavonoid and phenolic content were measured by the colorimetric method and found to be 511.19±35.75 and 24.64±0.07 mg, respectively. Subsequently, antibacterial, antioxidant, and anticancer activities were evaluated for the ethanolic extract. Antibacterial effectiveness was concentration-dependent against Staphylococcus aureus and Streptococcus mutans, showing optimal inhibition at 100 mg/mL with inhibition areas of 2.81±0.88 and 2.68±2.93 mm, respectively. Antioxidant activity was measured using DPPH with a 200 µg/mL of extract concentration, displaying maximum scavenging activity (71.85±6.43%) and FRAP activity (55.93±1.4%) at 0.64 µg/mL. The alcoholic extract exhibited decreasing vitality of (MCF-7) breast cancer cells as concentration increased, with viability reaching a minimum of 35.378 ± 5.072 at 400 μg/mL.
View
Evolution of Angiosperm Pollen. 7. Nitrogen-fixing Clade
Article
Full-text available
  • Jun 2019
Nitrogen-fixing symbiosis in root nodules is known in only 10 families, which are distributed among a clade of four orders and delimited as the nitrogen-fixing clade. As the seventh in a series that examines pollen morphological distribution and evolution in the angiosperms, this paper focuses on pollen morphological character states of the nitrogen-fixing clade. To illustrate the palynological diversity of the clade, we first examined pollen grains from 26 species with light electron, scanning electron, and transmission electron microscopy. Second, we used a reduced data matrix from Li et al. (2015) to reconstruct a maximum likelihood tree and then optimized 18 pollen character states onto the tree using Fitch parsimony, maximum likelihood, and hierarchical Bayesian inference. Finally, 12 plesiomorphic states for the nitrogen-fixing clade were inferred unambiguously under all methods, and more than 40 clades (or lineages) at or above familial level were characterized by unambiguous pollen character state changes in at least one of the optimizations. We found a number of evolutionary trends for changes in pollen character states. These include increasing grain size, increasing aperture number accompanied by concomitant changes in aperture position (from equatorial to global) and aperture shape (from colpate to colporate), and increasing complexity of tectum ornamentation. There was a strong correlation between some pollen characters (prolate shape class, lobe outline in polar view, colpate ectoaperture, lalongate and lolongate endoaperture, absent supratectal element, reticulate tectum) and insect pollination, while other pollen characters—simple aperture structure, porate ectoaperture, circular endoaperture, present and gemmate or echinate supratectal element, and imperforate tectum—were strongly correlated with wind pollination. In addition, rugulate tectum was significantly correlated with shrub habit while larger pollen size was significantly correlated with vine habit; the helophytic habitat was significantly correlated with having two apertures. Our study provides rich evidence for the phylogenetic significance of pollen morphological diversity in the nitrogen-fixing clade.
View
ResearchGate has not been able to resolve any references for this publication.