イエバエの卵巣発育に関する研究 : IV. 卵巣発育における脂肪体の機能

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In order to analyze the mechanism of ovarian development in the housefly, Musca domestica vicina Macquart, the functional role of fat body was investigated with special reference to nutrient supply to the developing ovary. 1. Histological study on the abdominal fat body of female fly showed that newly emerged one possesses two types of fat body; pupal fat body in a large quantity and adult fat body in a small quantity. The former contains much more amount of lipid and protein, whereas the latter abundantly encloses nucleic acid and lipid. And pupal fat body disappears shortly after emergence as a result of cell-lysis, while adult fat body exhibits vigorous development with aging of adults. Further, a correlationship was observed between the cell-lysis of pupal fat body and the growth of first-follicle. Such a tendency suggests us a close relationship between the function of fat body and the ovarian development. 2. To clarify the function of pupal fat body, the effect of protein or sugar diet on the egg production was next examined. The female fly given only a sugar diet is capable of producing the number of mature eggs which corresponds to about 70% of the milk-fed fly. When females were hemicastrated immediately after emergence, little difference was ascertained in the egg number of remaining ovary between the milk-fed and the sugar-fed ones. From these findings it was suggested that pupal fat body reserves so much quantity of vitellogenic substance to mature the follicles of unilateral ovary. 3. Effects of operation and starvation on the retention of pupal fat body were also investigated. Ovariectomy resulted in retardation of celllysis in pupal fat body, implying an influence of ovarian growth upon cell-lysis. Cell-lysis was also suppressed conspicuously in the starved-, decapitated- and allatectomized flies. With treatment of a juvenile hormone analogue, methoprene, cell-lysis of pupal fat body was accelerated remarkably in all females. From these facts it can be concluded that juvenile hormone stimulates cell-lysis of pupal fat body.
日本衛生動物学会の論文
1977-06-15

イエバエの卵巣発育に関する研究 : IV. 卵巣発育における脂肪体の機能

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