EFFECT OF JUVENILE HORMONE ON THE SYNTHESIS AND ACCUMULATION OF A SEX-LIMITED BLOOD PROTEIN IN THE POLYPHEMUS SILKMOTH

Abstract
Injection with juvenile hormone causes pupae of the Polyphemus silkmoth to undergo a pupal-pupal molt instead of a pupal-adult molt. Juvenile hormone also affects the concentration in the blood of a sex-limited blood protein, the yolk protein, which is normally synthesized by the fat body of the female pupa, released into the blood, and accumulated from the blood by the developing oocytes. When juvenile hormone is injected into a female pupa, the synthesis and release of the yolk protein are not affected. However, the oocytes do not grow and do not accumulate the yolk protein. Consequently, the concentration of the yolk protein in the blood of developing second pupae increases about four-fold. This effect becomes conspicuous seven days after juvenile hormone injection.

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