PROTEIN SYNTHESIS IN THE FAT BODY OF THE FIFTH LARVAL INSTAR PHILOSAMIA CYNTHIA LARVAE-RELATION TO TWO FEEDING PERIODS

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Abstract
In order to investigate the determinism of the metabolic variations associated with developmental change, protein synthesis was measured in vivo in the fat body of P. cynthia. During the 5th larval instar, 2 periods, the necessary feeding period and the facultative feeding period, which constitute decisive developmental periods of the insect, were examined. After incorporation of [3H]glycine, protein synthesis was estimated, taking into account the dilution of the radioactive amino acids in the free amino acid pool. During the necessary feeding period (from ecdysis to day 4) the protein synthesis increased steadily; during the facultative feeding period (from day 4 to onset of spinning), the protein synthetic level decreased. Some preliminary hypotheses are suggested for the mechanism responsible for protein synthesis variations during a larval instar.

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