摘要
应用电子显微镜技术观察了大黄鱼 (Pseudosciaenacrocea)的精子发生过程。其发生经历了初级精原细胞、次级精原细胞、初级精母细胞、次级精母细胞和精子细胞阶段。精子细胞再经过精子形成过程成为精子。在精原细胞阶段 ,部分核仁物质排出核外 ,成为拟染色体。拟染色体的主要成分是核糖体。在精子发生中 ,拟染色体逐渐扩散到生精细胞的胞质中。成熟分裂的前期Ⅰ ,同源染色体经历了联会复合体形成和解体的变化。在精子形成过程中 ,精子细胞先形成鞭毛 。
The spermatogenesis of the teleost, Pseudosciaena crocea (Richardson) was studied.There were five developmental stages in the spermatogenesis.They were primary spermatogonium,secondary spermatogonium,primary spermatocyte,secondary spermatocyte and spermatid.The spermatid differentiated into sperm via the process of spermiogenesis.During the stages of primary and secondary spermatogonia,components of the nucleolus were excluded from the nuclei.They were called chromatoid bodies.There were many chromatoid bodies in the cytoplasm.The chromatoid bodies first located in hollows on surface of the nucleus.Then they dispersed into the cytoplasm.It was suggested that the components of the chromatoid body were ribosomes.So many ribosomes produced by the primary and secondary spermatogonia may be used in the spermatogenesis.During the period of zygotene,prophaseⅠ,paired homologous chromosomes started to form synaptonemal complexes.The synaptonemal complexes were fully formed at pachytene and dissolved afterward.It was suggested that the synaptonemal complex was the symbol of genetic recombination between two homologous chromosomes.During the process of spermiogenesis,flagellum was formed first.Then the nucleus of the spermatid condensed step by step.
关键词
大黄鱼
精子发生
拟染色体
联会复合体
Pseudosciaena crocea
Spermatogenesis
Chromatoid body
Synaptonemal complex
