Abstract
Ecdysone and 20-hydroxyecdysone were added to artificial diets of the silkworm, Bombyx mori, to evaluate their effects on larval development and the ecdysteroid titer. Ecdysone at more than 50 p.p.m. induced extra larval ecdyses. In contrast, extra larval ecdyses did not occur at any concentration of 20-hydroxyecdysone. 20-Hydroxyecdysone present at a high concentration from hatching onward caused mortality during the second instar. In larvae reared on an ecdysone-supplemented diet the ecdysteroid titer rapidly increased, then declined sharply in each instar. In larvae reared on 20-hydroxyecdysone-supplemented diet, the ecdysteroid titer increased and remained high throughout the second instar. These results suggest that the effect of ecdysone on the mechanism regulating the ecdysteroid titer is qualitatively different from that of 20-hydroxyecdysone.
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