甘蔗黄螟精子的超微结构及辐射对其影响

本研究观察了正常黄螟睾丸中精子细胞的超微结构。并研究在蛹后期照射~(60)COγ—射线3.0万伦琴处理舌对当代雄虫,和照射1.5万伦琴处理后羽化的雄虫,与正常雌虫配对所产的子代雄虫(F_1)睾丸的精子细胞超微结构的影响。 经辐射处理后的当代雄成虫和(F_1)代雄成虫,其睾丸中的精子绝大多数具有正常的超微结构。从结果表明往后期蛹,用本试验的两个处理剂量,对当代及F_1代雄成虫精子的超微结构影响很小。在应用上,既能达到理想不育效果,又不影响其交尾受精竞争能力。本研究结果为应用辐射不育技术防治黄螟提供理论依据。

AN ULTRASTRUCTURAL STUDY OF THE SPERM AND THE EFFECTS OF IRRADIATION ON THE P AND F_1 PROGENY OF THE SUGARCANE YELLOW STEM BORER (Lepidoptera: olethreutidae)

Observation was done on the sperm from the testis of the Sugarcane Yellow Stem Borer, Tetramorea schistaceana (Lepidoptera, Olethreutidae). Emphasis was given to the comparison of the ultrastructure of the eupyrene and apyrene, and the effects of y-radiation on the ultrastructure of the sperm in P and F1 progeny of irradiated males.The results showed the number of sperms in most of the sperm bundles was 23, while in some of the apyrene bundles the number was 29. Both the eupyrene and apyrene had an axoneme with a configuration of 9 + 9 + 2 and a couple of mitochondria derivatives, which were more closely associated and uneven in size in the eupyrene while in the apyrene they were separated and similar in size. However, the most obvious difference was that the apyrene lacked elaborate lacinate appendages and reticular appendages, which extended from the plasma membrane of the eupyrene testicular spermatozoa.Irradiation of late pupae at a dosage of 30 KRad resulted in a few flagellar abnormalities in eupyrene sperms and several large bodies with high electron density mixed with the apyrenes in the sperm bundles. Irradiation of p late pupae at a dosage of 15 KRad resulted in a higher frequency of flagellar abnormalities in eupyrene sperms and irregular arrangement and degeneration of sperms in apyrene bundles of testis of F1 males produced from crossing irradiated P males with the untreated females. However, most of the sperms and sperm bundles found in either the treated P males or Fi males were mormal.