Diapause induction and photoperiodic clock in Chilo suppressalis (Walker) (Lepidoptera: Crambidae)

文献类型： 外文期刊

第一作者： Chen, Fang

作者： Chen, Fang;Han, Yongqiang;Hou, Maolin;Hu, Qiongbo

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关键词： diapause induction;short-day condition;circadian oscillator;facultative diapause;diapause incidence;photoperiodic response;rhythmic fluctuation;photoperiodic clock;photoperiodic clock mechanism;scotophase length;long-night cycle;non-oscillatory hourglass timer

期刊名称：ENTOMOLOGICAL SCIENCE （ 影响因子：1.602； 五年影响因子：1.35 ）

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收录情况： SCI

摘要： The mature larvae of the rice stem borer, Chilo suppressalis Walker (Lepidoptera: Crambidae) enters facultative diapause in response to short-day conditions in the autumn (August-September). Diapause induction and photoperiodic clock mechanism were investigated in C. suppressalis larvae reared on an artificial diet in the present study. The critical night length for diapause induction was about 9 h 53 min to 10 h 39 min at 22 to 28 degrees C. The third-instar larvae were found to be relatively sensitive to diapause induction. Photoperiodic response under non-24-h light-dark cycles showed that scotophase length played an essential role in the induction of larval diapause in C. suppressalis, and consecutive exposure to long-night cycles was necessary for a high diapause incidence. In the Nanda-Hamner experiment, diapause incidence peaked at scotophase of 12 h and dropped rapidly at scotophases > 24 h. In the Bunsow experiment, diapause incidence was clearly suppressed, especially at the light pulse located 8 h in the scotophase. Both the Nanda-Hamner and Bunsow experiments showed no rhythmic fluctuations with a period of about 24 h; thus the photoperiodic clock in C. suppressalis is a non-oscillatory hourglass timer or a rapidly damping circadian oscillator.

分类号： Q96

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