Abstract
Administration of a high dose (100 μg) of 20-hydroxyecdysone to a Bombyx pupa aged 2 days caused a reduction in content of ribosomes, translatable mRNA, and polysomes of the ovaries. This coincided with the lower relative content of putative chorion proteins in the hormone-treated pupae. However, no large influence of the hormone treatment was detected at the translational level. The developmental time of the ovaries was muchprolonged in the hormone-treated animals, and this seemed to compensate for the above decrease in protein content and finally caused a deposition of a normal amount of chorion proteins in oviposited eggs. These results support the idea that the amount of chorion proteins is related to the developmental time of the ovary.
