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Embryological Studies of Stipagrostis plumosA (L.) Munro ex T. Anderson

MOHAMMAD INAMUDDIN, KHALIFA M. MAGHBOUB AND M. SAQUIB*

Abstract: Embryological studies of Stipagrostis plumosa (L.) Munro ex Anderson have been made. The development of anther wall is Monocotyledonous type. The tapetal cell is uni-nucleate and glandular. Middle layer is ephemeral and endothecial cells develop fibrous thickenings. The microspore mother cells undergo successive meiotic divisions and result in the formation of isobilateral microspore tetrads. The pollen grains are triporate and shed at 3-celled stage. The ovule is anatropous and bitegmic. The chalazal megaspore of a linear tetrad develops into Polygonum type of embryosac. Sometimes, the antipodal cells vary from 3-7 in number.

Department of Botany, Faculty of Science, University of Al-Fateh, P.O. Box 13228, Tripoli, Libya and

*Department of Biology, Faculty of Natural Sciences, University of Guyana, Turkeyen Campus, PO Box 10-1110, Georgetown, Guyana South America.

Correspondence Author's E-mail: drinambot@yahoo.com