蝗虫精母细胞减数分裂各时期的识别

蝗虫具有材料易得、染色体大、染色体数相对较少等优点, 被普遍用于观察精子发生中减数分裂各个过程。蝗虫精巢制片简单、快速, 但初学者普遍感到辨别分裂相较为困难。鉴于此, 文章以东亚飞蝗(Locusta migratoria manilensis (Meyen))精母细胞的减数分裂过程为例, 介绍如何根据染色体的数目及染色体构象, 识别减数分裂各个时期。此外, 文章也简要描述了东亚飞蝗精母细胞的有丝分裂及精子形成过程, 供初学者参考。

Identification of the meiotic events in grasshopper spermatogenesis

The grasshoppers are ideal materials to study various meiotic stages of spermatogenesis due to their easy availability, fairly large chromosomes, and fewer numbers of chromosomes. It is easy to make temporary squash preparation of grasshopper testes; however, it is usually difficult for the beginners to differentiate between stages of meiosis. In view of this, we demonstrated the method of identification of meiotic stages by chromosome number and chromosome conformation, taking spermatogonial meiosis of Locusta migratoria manilensis as an example. We described briefly the mitosis of spermatogonia and the spermatogenesis of this species as well.