哲罗鱼精子的超微结构

Ultrastructure of the spermatozoon of Hucho taimen

应用透射电镜观察了乌苏里江哲罗鱼(Hucho taimen)精子的超微结构。哲罗鱼的精子由头部、中段和尾部组成。头部呈卵圆形,主要结构是细胞核。核前端无顶体,后端有植入窝,核中染色质致密,存在着不规则的网络状间隙。中段包括中心粒复合体和袖套。近端中心粒为9组三联微管结构,与远端中心粒相互垂直。袖套与细胞核后端相连,含有丰富的线粒体和囊泡,部分线粒体彼此融合,形成复合线粒体。尾部细长,主要结构是轴丝,为典型的"9+2"微管结构。尾部的近核段有许多囊泡包围着轴丝,远核段则无此结构。尾部有对称排列的波纹状侧鳍。

Ultrastructure of spermatozoon of Hucho taimen in Wusuli River was observed by transmission electron microscopy. The spermatozoon of Hucho taimen consisted of a head, a midpiece and a tail. The head was ovoid in shape, of which the main structure was nucleus. It had no acrosome and at its caudal end the nucleus had an implantation fossa. The nucleus consisted of electron dense chromatin materials and contained irregularly netlike gap. The midpiece consisted of the centriolar complex and the sleeve. The proximal centriole, which is made up of nine triplets of peripheral microtubules, and the distal centriole were arranged at a right angle to each other. The sleeve, which contained a high number of mitochondria and vesicles, was connected to the posterior end of the nucleus. Some of the single mitochondria were fused with each other and formed a complex chondriosome. The main structure of the tail was axoneme, which was slim and long. The structure of the tail was of the typical ＂9＋2＂ model. At the proximal end of the tail there were many vesicles outside the axoneme. The distal end of the tail, however, did not contain any vesicles. The tail had lateral fins, which were undulating and arranged symmetrically.