Juvenile hormone mediated DNA synthesis during larval development of Corcyra cephalonica (Insecta)

Large amount of DNA is synthesized during larval development of Corcyra and this is conspicuously seen in the early-last instar. Ligation in early-last instar causes a decline in both DNA content and DNA concentration. Radiolabelling studies show a low rate of DNA synthesis in isolated abdomens, suggesting that hormonal factors from the anterior half of the larvae play a regulatory role in the DNA metabolism. Juvenile hormone I (JH-I) treatment of ligated early-last instar stimulates DNA synthesis with consequent increase in DNA content and DNA concentration.