Isoetes yunguiensis is a specialty relict fern of Yunnan-Guizhou Plateau,which is a national level protected species called living fossil of the study on paleoecology and plant evolutionary in Yunnan and Guizhou area,but its reproduction and endangered mechanism is unclear. On the basis of implementation of artificial breeding and acquisition of adequate research materials,the authors observe the embryonic development of I. yunguiensis using thin sectioning. The main results of observation of the embryonic ...
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