简单管蓟马（布法）（缨翅目）的异常精子发生：超微结构研究

The aberrant spermatogenesis of the Haplothrips simplex (Buffa) (Thysanoptera): ultrastructural study.

作者信息

Paccagnini E, De Marzo L, Giusti F, Dallai R

机构信息

Department of Evolutionary Biology, University of Siena, Via A. Moro 2, I-53100 Siena, Italy.

出版信息

Tissue Cell. 2006 Jun;38(3):177-86. doi: 10.1016/j.tice.2006.02.002. Epub 2006 Apr 18.

DOI:10.1016/j.tice.2006.02.002

PMID:16620898

Abstract

The aberrant spermatogenesis of the haploid insect Haplothrips simplex (Thysanoptera) is described. The process, which occurs in the pupal instars, is characterized by two mitotic divisions, the second of which gives rise to two different-sized spermatids: the larger spermatids have a nucleus with diffuse chromatin and proceed into spermiogenesis, while the small spermatids have pycnotic nuclei and degenerate. Both types of spermatids contain two centrioles parallely rather than orthogonally oriented. The occurrence of two centrioles supports a close relationship between Thysanoptera and Phthyraptera. Before the beginning of spermiogenesis, however, the functional spermatids show the unusual presence of a third parallel centriole which is formed by the duplication of one of the two pre-existing centrioles.

摘要

描述了单倍体昆虫简管蓟马（缨翅目）异常的精子发生过程。该过程发生在蛹龄期，其特征是有两次有丝分裂，第二次有丝分裂产生两种不同大小的精细胞：较大的精细胞有一个染色质分散的细胞核并进入精子形成过程，而小精细胞有固缩的细胞核并退化。两种类型的精细胞都含有两个平行排列而非正交排列的中心粒。两个中心粒的存在支持了缨翅目和食毛目之间的密切关系。然而，在精子形成开始之前，功能性精细胞显示出异常存在由两个预先存在的中心粒之一复制形成的第三个平行中心粒。