Study of genesis stages of pollen and ovule development in Astragalus stevenianus

In this research, the developmental stages of ovule and pollen in Astragalus stevenianus of the Fabaceae family were studied. For this purpose, fluorescence and polarization optical microscopes and various cytohistological techniques were used. The results of this study showed that anthers have tetrasporangiate and its tapetum layer is of secretory type. The cytokines were synchronous and the microspore tetrads are of both tetrahedral and tetragonal type. Pollen grains were threecells and triporated at the time of pollination. In polar view, they are circular shaped and in elliptical view, they are oval shaped. The ovule is anatropous, crassinucellated and biinteguments.The endothelium layer is made up of one layer cells, and the genesis of the embryo sacs of polygonom type. After the meiosis division, megasporetetrads has a linear arrangement. On the outer surface of the pistil, many trichomes were observable. In this spices, the number of antipodal cells is more than three. Based on our bibliographical studies, this is the first report about the development of reproductive organs of the species.

کلیدواژه ها:

Development ، Embryo sac ، Fagaceae ، Astragalus stevenianus