Abstract
Vitellogenesis in the lady beetle, Coccinella septempunctata, is controlled by juvenile hormone (JH). When immature females were reared on an artificial diet, they were characterized by hypertrophy of the fat bodies and slow development of the ovaries. Vitellogenin (Vg) synthesis in the fat body remained at a very low level throughout adult development. RNA synthesis also stayed at a relatively low level. Treatment with hydroprene induced vitellogenesis in these non-fecund females. Stimulation in Vg synthesis in hormone-treated females was demonstrated both in vivo and in fat body culture. Synthesis of fat body RNA also increased after hormone treatment. Fat body RNA from hormone-treated females directed the synthesis of Vg polypeptides both in Xenopus oocytes and in a reticulocyte lysate. Thus the induction of Vg synthesis by JH involves an increase in the level of translatable Vg mRNA.
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