Taxonomic significance of the seed characters of certain species of tribe Asclepiadeae in Egypt | ||
| Taeckholmia | ||
| Article 5, Volume 25, Issue 1, 2005, Pages 91-109 PDF (717.92 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/taec.2005.12309 | ||
| Authors | ||
| Samia Heneidak* 1; Abdel-Rahman Hassan2 | ||
| 1Biological & geological Department, Faculty of Education in Suez, Suez Canal University, Egypt | ||
| 2Agricultural Botany Department, Faculty of Agriculture, Ismailia, Suez Canal University, Egypt | ||
| Abstract | ||
| Seed external morphology and coat anatomy of ten species of tribe Asclepiadeae (Asclepiadoideae-Apocynaceae) in Egypt are investigated using Light Microscope (LM) and Scanning Electron Microscope (SEM). Seed features studied include variations in shape, colour, texture, hilar details, surface scan characteristics and seed coat anatomy. Anatomically, the testa has been found to be of greatest value in determining taxonomic relationships. Some seed characters were found to be very distinct at the generic level, such as the presence of two rows of the palisade-like cells of the seed wing (one upper and one lower) which could be considered as taxonomic marker for the two Pergularia species. In addition, the presence of mounds on the upper concave side of the seed coat is recorded only in two Asclepias species and Solenostemma arghel; with large, tubular, lignified, pitted cells in two Asclepias species, and small, rectangular, radially elongated in Solenostemma arghel. | ||
| Keywords | ||
| Apocynaceae; Asclepiadeae; Asclepiadoideae; seed anatomy; seed coat sculpture | ||
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