小地老虎真核和无核精子的超微结构

ULTRASTRUCTURE OF EUPYRENE-APYRENE SPERM AGROTIS YPSILON

详细描述了小地老虎真核与无核精子各部分的超微结构,并比较了和其它鳞翅目昆虫精子的异同。真核 精子具有比核还长的顶体,其前端与后端异形,均具有明显的内核;顶体与核之间存在一较短的连接区域。真核精子的核前部呈新月形至半圆形,后部呈圆形或大半圆形,质膜上覆盖有两种网状外长物和片层外长物,无核精子只有顶体与鞭毛两部分。

Observations under transmisson electron mieroscope showed that cupyrene sperm of blackcutworm (Agrotisy psilon Rot.) consists of acrosome,acrosome-nucleus connective,nucleus,flagellum andappendages on the plasma membrane,etc.;While the apyrene sperm is only composed of acrosome andflagellum.Some different results are reported as follows:1.Eupyrene sperm has a rather significantacrosome,which is of the electron-opaqu shape of two adjunct trapeziums or a single triangle conjugated withanother V-shaped structure in transverse sections;the acrosome of apyrene sperm appears regularly circular.2.Between acrosome and nucleus exists a short connection structure,which is composed of twenty to thirtysinglet tubules dispersed in moderate electron density matrix.3.Nucleus of eupyrene sperm has differentshapes from anterior to posterior portion,and appears crescent,semi-circular,nearly circular,circular,respectively.4.A single reticular appendage and many lacinate appendages are associated with the plasmamembrane of eupyrene sperm,and the appendage configuration changes considerably on each portion of thesperm.