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Studies on development of male gametophyte and female gametophyte of Cistanche deserticola Ma

MA Xue-ping~ 1,2 ,SONG Yu-xia~ 1 ,MA Hong-ai~1,GUO Sheng-hu~1,LI Miao~1(1.Ningxia Agricultural Biotechnological Key Laboratory,Yincuan Ningxia 750002,China;2. Ningxia University of life science,Yinchuan Ningxia 750002,China)  
Cistanche deserticola Ma, a kind of root parasitic psammophyte, is an endangered rare Chinese traditional medicines plant living desert. The overall male gametophyte and female gametophyte were studied of Cistanche deserticola Ma with optical microscope and means of paraffin method. The main results can be concluded as follows: Cistanche deserticola Y.C.Ma was a hermaphrodite species; there were four anthers, a anther had four anther sac. The archesporial cell developed to microspore mother cell or own functions of microspore mother cell. Meiosis of microspore mother cell was normal and cytokinesis was of simultaneous type, the tetrad was tetrahedron. In the course of development of male gametophyte, a part of microspore was abortion;the mature pollen was 2-celled. The development of the anther wall belonged to a dicotyledonous type, it consisted of epidermis, endothecium, middle layer (two layers) and tapetum. The tapetum was glandular tapetum of heteromorphism development of the gynoecium was normal, the ovary was solitary carpel and unilocular, it was unitegmic,tenuinacellar and anarropous. The embryo sac originated from the single archesporial was firstly atrophied, the following was megaspore of chalazal end developed to functional megaspore, the development of embryo sac is of the Polygonum type. cell, Meiosis of the megaspore mother cell formed dyad, and developed to linean tetrad.3-megaspore of micropylar end gradually atrophied, the third megaspore of micropylar end.The result will provid cytology evidence for protecting resources of Cistanche deserticola.
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