摘要
从形态学方面对小菜蛾精子发生过程进行了系统观察.结果表明,小菜蛾精巢主要在末龄幼虫期的4龄发育,4龄当天即开始出现成熟的精子,幼虫期主要生成无核精子,有核精子主要在成虫期形成.小菜蛾的二型精子(Dichotomic Spermatogenesis)在其初级精母细胞期发生分化,精巢中出现无核和有核2种初级精母细胞.小菜蛾成虫每个精子束中含有256个精子,无核精子长度大约为20μm,而有核精子长度约为12μm.小菜蛾精原细胞染色体数目为30对.
The spermatogenesis in the diamondback moth, Plutella xylostella （ L. ） （ Lepidoptera： Plutellidae） was investigated by light and ultrastructural observations. The results showed that the testis of P. xylostella developed rapidly in the last 4th instar larvae, and mature sperms were detected on day 1 of the 4th stadium. The onset of the apyrene spermatogenesis started in the 4th instar larva or before, while the euprene spermiogenesis occurred in the adult. The dichotomic spermatogenesis of P. xylostella occurred in the stage of primary spermatocyte supported by the occurrence of apyrene and eupyrene primary spermatocytes within testis. Every sperm bundles of P. xylostella includes 256 sperms. The length of apyrene sperm is about 20 μm long, and eupyrene one is about 12 μm long. The chromosome number in mitotic metaphase of spermatogonia of P. xylostella is 30 pairs.
出处
《河南农业大学学报》
CAS
CSCD
北大核心
2008年第2期210-215,共6页
Journal of Henan Agricultural University
基金
国家自然科学基金项目(30471168)
关键词
小莱蛾
有核精子
无核精子
精子发生
Plutella xylostella
eupyrene
apyrene
spermatogenesis
