朱砂叶螨精子的超微结构及形成过程

SPERM ULTRASTRUCTURE AND SPERMIOGENESIS OF TETRANYCHUS CINNABARINUS (BOISDUVAL)

朱砂叶螨精子染色质高度浓缩，无核包被、鞭毛和顶体结构，精子内部无线粒体和核糖体。精子双层膜厚度为０．０１５～０．０２５μｍ，精细胞管状膜的高度和宽度分别是０．２５～１．３３μｍ和０．０２５～０．０３３μｍ，精子和核直径分别为１．３～１．５μｍ和０．６～０．７μｍ。精子形成时，首先精子内核物质分散、有包被，无管状膜内陷；然后管状膜内陷．放射状；接着管状膜内陷不断扩展成为小囊泡状，核物质集中在中央，校包被消失；最后管状膜囊泡状内陷排列从无序走向有序，形成成熟的精子。

The sperm ultrastructure of Tetranychus cinnabarinus(Boisduval) is simple due to the condensation of thechrorpatin and the absence of nuclear envelope, flagellum and acrosome. Mitochondria and ribeomes are not seen.The outer two-layers membrane is 0. 015-0. 025 μm thick, the height and width of cuboidal invaginations of plasmamembrane are 1. 33-2. 5 μm and 0. 025-0. 033μm respectively. The diameters of mature sperm and itS nucleus are1. 3-1. 5μm and 0. 6-0. 7μm respectively. SpermioSenesis begins with the invagination of the plasma membrane,and the diffusion of nuclear materials, then nuclear materials centralize and nuclear envelope disappers, at the end,nuclears and cytoplasm condense, cuboidal invaginations of plasma membrane are arranged in an orderly way.