Eupyrene and Apyrene Spermatogenesis in the Asian Comma Butterfly, Polygonia c-aureum (Lepidoptera : Nymphalidae)
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The processes of eupyrene and apyrene spermatogenesis from the 4th larval instar to adult eclosion, the differentiating mechanism of the two types of sperm and the relationship between spermatogenesis and adult diapause in P. c-aureum were studied. It was assumed that the large cysts were destined for eupyrene sperm whereas the small ones except some spherical cysts were destined for apyrene sperm. Based on their shape, cysts were divided into three developmental stages, i.e. spherical, pyriform and elongate stages. The results showed that spermatogenesis during the larval and pupal stages proceeded in the same way between individuals reared under diapause-inducing (8L16D and 21℃) and diapause-averting (15L9D and 21℃) conditions, respectively. Although eupyrene spermatogenesis preceded apyrene spermatogenesis, the former continued even during the pupal stage when apyrene spermatogenesis was most active. This observation may indicate that there is no switch-over from eupyrene to apyrene spermatogenesis. The proportions of cysts with different sizes suggested that spherical cysts as well as pyriform and elongate cysts followed the dichotomous developmental pathways into small and large sperm. Furthermore, the primary spermatocytes showed two peaks in frequency distribution of their sizes. These results strongly suggest the possibility that differentiation into eupyrene or apyrene cysts could occur much earlier than the primary spermatocyte stage. In conclusion, differentiation of the two types of sperm is difficult to be explained by assuming the presence or absence of the apyrene-sperm-inducing-factor (ASIF) proposed by Friedlander and Benz (1981).
- 日本昆虫学会の論文
- 1999-09-25
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関連論文
- Effects of Aging and Temperature on the Male's Reproductive Development of the West Indian Sweetpotato Weevil, Euscepes postfasciatus (Fairmaire)(Coleoptera : Curculionidae)
- Eupyrene and Apyrene Spermatogenesis in the Asian Comma Butterfly, Polygonia c-aureum (Lepidoptera : Nymphalidae)