摘要
本文在超微结构水平上研究文昌鱼(Branchiostoma belcheri Gray)精子发生过程中细胞形态结构的变化和细胞器的演变规律。观察到精细胞核形态变化的特点、线粒体的演变及其原始结构形式。同时,也观察到精细胞变态过程中高尔基体的演变、顶体的形成及超微结构的特点和微管的重组。此外,我们还首次观察到尾丝外膜上有特殊的刺状结构。对以上观察结果,进行了讨论。
The present paper discusses the studies on morphological and structural change of cell in the spermatogenesis process of Xiamen amphioxus(Branchiostoma belcheri Gray)by electron microscopy.The characteristics of ultrastructure of various order spermatogenesis cells and sperms are described in detail.The studies indicate that concentration process of chromatin of spermatoblast nuclei differs from that of sea-urchin etc.,butitis similar to that of birds.This process is shown as follows,fine grain form-small mass form-uniform materials with higher electron density.It follows that free surface of chromatin decreases and its structure stability increases.This favours to accomplish the function of fertilization.The change of nucleus form and the concentration of chromatin are probably due to the action of external forces produced by the formation of the acrosome,the gathering of the mitochondria and the extension of the microtubules.The acrosome observed in this material possesses the structure of polylayer membranes.It is neither like the complete acrosome complex of some of the higher animals,nor like the incomplete acrosome amassed by vesicle of invertebrate.And it also shows that the formation of the acrosome and the synthesis and concentration of contents are closely related to Golgi complex.Besides,this paper indicates that the numbers,the distribution position and the ultrastructure of mitochondria,all have a change.The rules of its transformation are similar to invertebrate(such as Lingula anaiina Bruguiere,etc.)and vertebrate(Perin,etc.).But the inner structure is different from that of higher animal and similar to that of the lower animal fertilized in water(Brachiopoda).This not only shows the relativity and the continuity of system development,but also holds the originality of individual development.At the same time,the roles of microtubules systems in the change and remaining of nucleus form,and transporting preacrosome substances are found.It is of interest to note that the special structure of thorny form on external membrane of tail filament is observed.This structure has never been reported on the sperm of other genus of animal.
作者
林加涵
陈细法
汪德耀
Lin Jiahan;Chen Xifa;Wang Deyao(Ouang Teyio)(Xiamen University)
出处
《海洋与湖沼》
1987年第5期432-436,516,共6页
Oceanologia Et Limnologia Sinica
