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Journal of Experimental Biology 109,191-199 (1984)
Published by Company of Biologists 1984

Juvenile Hormone Involvement in Pupal Diapause of the Flesh Fly Sarcophaga Crassipalpis: Regulation of Infradian Cycles of O₂ Consumption

D. L. DENLINGER ¹, M. SHUKLA ¹, and D. L. FAUSTINI ²

¹ Department of Entomology, Ohio State University, Columbus, Ohio 43210, U.S.A.
² Department of Entomology, Ohio State University, Columbus, Ohio 43210, U.S.A.; Present address: Phillip Morris U.S.A., Research Center, P.O. Box 26583, Richmond, Virginia 23261, U.S.A.

1. A cyclic pattern of juvenile hormone (JH) activity is retained during pupal diapause in the flesh fly, Sarcophaga crassipalpis.

2. Cycles of JH activity correlate with infradian cycles of O₂ consumption. JH activity progressively increases during a 4-day cycle and appears to trigger the onset of an M₀₂ peak.

3. During the first 2 days of an M_OO2 cycle, pupae are insensitive to an application of JH analogue, but when JH analogue is applied during the last 2 days of the cycle, M₀₂ rises and the cyclic M₀₂ pattern is destroyed. When JH analogue is applied to third instar larvae, O₂ consumption is sustained at a steady, high rate throughout pupal diapause.

4. The M_OO2 cycles persist in abdomen-ligated pupae but disappear following head ligation.

Key words: Juvenile hormone, diapause, O₂ cycles

Accepted on October 26, 1983