太平洋牡蛎精子形成的研究

Studies on Spermiogensis of the Pacific Oyster, Crassostrea gigas Thunberg

透射电镜下研究了太平洋牡蛎 (Crassostrea gigas Thunberg)的精子形成过程。精子细胞中含有前顶体颗粒、线粒体、高尔基体、中心粒等多种细胞结构 ,线粒体、前顶体颗粒的数量较多。在精子形成过程中 ,前顶体颗粒逐渐汇集、愈合成顶体泡 ,顶体泡覆盖在细胞核的一端逐渐发育为顶体 ;线粒体则向顶体相反的方向移动 ,最后移到核后端形成 4个较大的线粒体球 ;中心粒移到核后端由远端中心粒形成轴丝 ;细胞核发生致密 ,形态发生变化 ,最后形成杯状的精子核 ;多余的细胞质被抛弃。

The spermiogensis of pacific oyster, Grassostrea gigas was studied with electron microscope. Spermatid consisted of proacrosomal granules, mitochondria, golgi body, centriole and many other organelles. There are plenty of proacrosomal granules and mitochondriaes in spermatid. At the stage of metamorphosis, proacrosomal granules gathered and cicatrized gradually and formed a bigger acrosomal vesicle, which covered at the anterior part of nucleus and formed cap-shaped acrosome. Mitochondria gathered reverse with proacrosomal granules and fused with 4 bigger globe-shaped mitochondria. Centriole moved to post end of nucleus and formed axoneme by the distal centriloe. The nucleus condensed. its size reduced gradually and changed into a cup shape in the end. Golgi body and redundant cytoplasm went down the drain at last.