MEGAGAMETOPHYTE AND EMBRYO DEVELOPMENT IN FIVE SPECIES OF ASTRAGALUS (FABACEAE)

سال انتشار: 1390
محل انتشار: مجله گیاه شناسی ایران، دوره: 17، شماره: 2
کد COI اختصاصی: JR_IJB-17-2_004
زبان مقاله: انگلیسی
تعداد مشاهده: 180

نویسندگان

Master of Science / Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran, P. O. Box: ۱۴۵۱۵/۷۷۵

Ahmad Majd

Professor / Islamic Azad University, North Tehran Branch, Faculty of Science, Department of Biology, Tehran, Iran

Taher Nejadsattari

Associate Professor / Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran, P. O. Box: ۱۴۵۱۵/۷۷۵

Ali Asghar Maassomi

Professor / Research Institute of Forests and Rangelands, Department of Botany, Tehran Iran

Ali Mazouji

Assistant Professor / Islamic Azad University, Roodehen Branch, Department of Biology, Roodehen, Iran

چکیده

The development of the megagametophyte, embryo and the endosperm in Astragalus eriocarpus (sect. Malacothrix), A. glaucacanthus (sect. Poterion), A. remotijugus (sect. Caprini), A. chrysostachys (sect. Hymenostegis) and A. compactus (sect. Rhacophorus) were examined. The ovule are campylotropous, bitegmic and crassinucellate; integuments form a zig-zag shaped microphyle. The embryogenesis was similar in the species. Megagametophyte development follows the monosporic Polygonum type and the embryo development follows the Onagrad type. The fusion of the polar nuclei, development of the endosperm, digestion of the nucellus, seed abortion and suspensor development show major differences among studied species. Furthermore, the size and shape of the suspensor is quite variable among the five species. These characters are compared with the other species of Astragalus and also their phylogenetic significance is discussed. Also we describe a case of polyembryony for the first time in A. remotijugus.

کلیدواژه ها

embryogenesis, suspensor, suspensor haustorium, polyembryony, abnormal embryo, Astragalus, Fabaceae

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