, Volume 167, Issue 2, pp 167-171

Photoperiodic induction of the first and the second diapause in the bean bug, Riptortus clavatus: a photoperiodic history effect

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Summary

In nondiapause adults raised under a long-day photoperiod, the critical daylength for diapause induction was between 13 and 14 h although some individuals did not respond to the short-day photoperiod and went on laying eggs. In postdiapause adults in which LD 13∶11 induced the first diapause (L13 insects), the critical daylength for diapause reinduction was between 13 and 14 h, whereas it was between 12 and 13 h in postdiapause adults in which LD 10∶14 induced the first diapause (L10 insects). Under LD 13∶11, a small proportion of L10 insects went into the second diapause after great delay as compared with L13 insects. Under LD 10∶14, on the other hand, L10 insects went into the second diapause more rapidly than L13 insects. Therefore, the photoperiod which had induced the first diapause affected the photoperiodic induction of the second diapause not only in the critical daylength but also in the speed of response. In Riptortus clavatus, the photoperiodic history influences the subsequent photoperiodic response even after a physiological state induced by the previous photoperiod was terminated completely.