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Comparative Morphology of Pollen Grains of Some Taxa of Tribe Trifolieae (Fabaceae: Papilionoideae) from Egypt

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Author(s): Gamal M.A. Lashin

Journal: International Journal of Botany
ISSN 1811-9700

Volume: 2;
Issue: 3;
Start page: 270;
Date: 2006;
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Keywords: Pollen grains | subfamily Papilionoideae | tribe Trifolieae | LM-SEM

ABSTRACT
Pollen grains of nine taxa of five genera of the tribe Trifolieae of subfamily Papilionoideae, including Ononis serrata and O. vagineiles have been investigated. Using both Light Microscope (LM) and Scanning Electron Microscope (SEM) to evaluate the comparative morphology of the pollen in the tribe. The morphology of the pollen grains shows that they are radially symmetrical, isopolar trizonocolporate, with perforate tectum and varying shape and sculpture. Based on tectum structure, four distinct pollen types viz., Melilotus sp. (tectate perforate, reticulate and pore distinct), Trigonella sp. and Medicago sp. (tectate imperforate, reticulate, verrucate and pore indistinct), Trifolium sp. (semi-tectate, reticulate and pore indistinct) and Ononis sp. (tectate perforate, regulate and pore distinct) are distinguished. The pollen morphology of these taxa shows that Trifolieae is eurypalynous tribe. These data may be support the earlier separation of the genus Ononis from the tribe Trifolieae in a separate tribe Ononideae. Furthermore, these results helps establish the taxonomic position of the species within the tribe.
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