紧密角管藻雄配子的超微结构

Ultrastructure of male gametes in Cerataulina compacta

紧密角管藻精子发生是由精母细胞减数分裂先产生双鞭毛体 ,然后双鞭毛体分裂形成单鞭毛的精子 .精子鞭毛器的结构包括鞭毛轴丝和基体 ,鞭毛轴丝含有 9对二联体组成的周位微管 ,但无中央微管 ,属于“9+ 0”微管构型 ,基体靠近细胞核 ,由 9对二联体周位微管和中央结构组成“车轮”状结构 ,在过渡区存在基板 .精原细胞、双鞭毛体和精子的细胞器组成及结构与营养细胞相似 ,在生殖细胞中未发现高尔基体 。

The spermatogenesis of Cerataulina compacta was that the spermatocytes first produced biflagellate cells through miosis and then the biflagellate cells divided into uniflagellate sperms.The flagellar apparatus included flagellar axoneme and basal body.The axoneme consisted of 9 doublet microtubules, lacking central tubules,which was “9+0” frib pattern, paraxial swellings were found in axoneme,their structures were not clear.The basal body attached to nucleus contained 9 doublet microtubules,which were extended from axoneme, and a central structure to construct a “wheel”pattern, it was a focus of microtubules,possibly functioning as a centriole.Within axoneme and basal body there was a basal plate.The composition and structure of organella in spermatocytes、biflagellate cells and sperms was similar to those in vegetative cells,no Golgi body was found in the sexual cells, but containing high electon dense bodies. [WT5F1]