银杏精原细胞和精细胞的初步研究

0　引　言由于银杏(ＧｉｎｋｇｏｂｉｌｏｂａＬ.)独特的系统学地位及精子结构的特殊性,对银杏生殖生物学的研究工作一直是裸子植物胚胎学研究的热点之一1～12]。这些研究表明,银杏精原细胞从产生到最后形成精子历时3个月左右1～5]。在此期间,其体积增大数倍,结构发生了...

The Spermatocyte and Spermatozoid of Ginkgo biloba

During the nearly three month period of differentiation and development of the spermatocyte of the Ginkgo biloba, the spermatocyte nucleus had changed from spherical- to spindle- and back again to spherical-shaped in succession. As the nucleus was at the spindle-shaped stage, blepharoplast, vacuole-like structures and fibrillogranular body appeared in its cytoplasm, the former two were symmetrically arranged along the nucleus, while the fibrillogranular body was situated in the proximal face, Such arrangement may play a most important role in the regulation and in consequence may lead to the anticlinal division of the spermatocyte. The newly formed spermatozoids which stood against each other along their flat faces, had 3-4 levo-rotated gyres of flagellates as one of the end. The vacuole-like structure in each of the spermatozoid laid either at the proximal or distal face, or alternatively. The newly formed spermatozoid with the appearance of the fertilization drop was a very important phenomenon for getting spermatozoid of Ginkgo biloba efficiently.