Dabbub, H., Salim, M., Abdel-Hameed, U., Tantawy, M., Mohamed, A. (2020). A Contribution of the Palynological Criteria in Evaluating the Relationships among some Species of Apocynaceae Sensu Lato . Egyptian Journal of Botany, 60(2), 437-449. doi: 10.21608/ejbo.2020.19589.1387
Hanan Dabbub; Mohamed Salim; Usama Abdel-Hameed; Mohamed Tantawy; Alsafa Hassan Mohamed. "A Contribution of the Palynological Criteria in Evaluating the Relationships among some Species of Apocynaceae Sensu Lato ". Egyptian Journal of Botany, 60, 2, 2020, 437-449. doi: 10.21608/ejbo.2020.19589.1387
Dabbub, H., Salim, M., Abdel-Hameed, U., Tantawy, M., Mohamed, A. (2020). 'A Contribution of the Palynological Criteria in Evaluating the Relationships among some Species of Apocynaceae Sensu Lato ', Egyptian Journal of Botany, 60(2), pp. 437-449. doi: 10.21608/ejbo.2020.19589.1387
Dabbub, H., Salim, M., Abdel-Hameed, U., Tantawy, M., Mohamed, A. A Contribution of the Palynological Criteria in Evaluating the Relationships among some Species of Apocynaceae Sensu Lato . Egyptian Journal of Botany, 2020; 60(2): 437-449. doi: 10.21608/ejbo.2020.19589.1387
A Contribution of the Palynological Criteria in Evaluating the Relationships among some Species of Apocynaceae Sensu Lato
1Department of Biology, Faculty of Education, Alzawia University, Alzawia, Libya
2Department of Botany, Faculty of Science, Ain Shams University, Cairo, Egypt
3Department of Biology, College of Science, Taibah University, Madinah, Kingdom of Saudi Arabia
Abstract
APOCYNACEAE sensu lato is an interesting family with respect to pollen diversification. The pollen grains of 19 species (representing four out of five subfamilies and 18 genera) of Apocynaceae were collected and investigated using LM & SEM. The specific objective of the present study is to shed light on the different pollen morphological characters of the species under investigation and to discuss whether pollen morphology is considered an additional fundamental tool that helps in explanation of the evolutionary trend within the family. The obtained pollen data are considered diagnostic at the specific level viz. pollen association, class, polarity, sculpture, orientation and attachment of the translator. Carissamacrocrpa (Rauvolfioideae) gathered with the studied species of Apocynoideae based on the presence of porate pollen. In Cryptostegiagrandiflora, the pseudo-pollinarium is considered a link between monads (as in Rauvolfioideae and Apocynoideae) and the true pollinia (as in Asclepiadoideae). Pollen criteria facilitate the construction of dendrogram, a tentative presentation of phylogenetic relationship and an artificial key to achieve further delimitation between the species under investigation and discussing the interrelationships in the view of dicta of advancement. The palynological criteria in the present study reinforced the treatment of Apocynaceae s.l. as two distinct taxonomic families (Apocynaceae and Asclepiadaceae).
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