INFLUENCE DU JEUNE AU NIVEAU ORGANIQUE CHEZ PHILOSAMIA CYNTHIA WALKERI. POIDS ET INCORPORATION A LONG TERME D'ACIDES AMINES

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Abstract
The weight of organs and course of long term incorporation of amino acids into proteins are followed during a 48 h starvation in P. cynthia walkeri. In each organ, both parameters follow synchronous development: decrease of weight and amount of radioactive proteins since the beginning of starvation in the fat body; rapid increase during the first 6-12 h in the intestine and integument, then a decrease. In hemolymph the amount of radioactive proteins increases for 6 h and is stable thereafter. At the same time, the acid-soluble radioactivity is more depressed in the fat body than in hemolymph, and less in the integument and silk gland than in hemolymph. These results are discussed in relation with the influence of the fat body on growth and metabolism regulations during starvation. Two main hypotheses are suggested: intense export of amono acids from fat body to hemolymph in order to maintain a high level of material in the internal milieu; continuation of the growth of organs during the first hours of starvation partly supported by the fat body.