Effects of temperature and photoperiod on termination of pseudopupal diapause in the bean blister beetle, Epicauta gorhami
Effects of temperature and photoperiod on termination of pseudopupal diapause in the bean blister beetle, Epicauta gorhami
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DOI：
10.1016/j.jinsphys.2012.02.009
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发表时间：
2012-05-01
影响因子：
2.2
通讯作者：
Shintani, Yoshinori
中科院分区：
文献类型：
--
作者：
Terao, Misato;Hirose, Yuzuru;Shintani, Yoshinori
大斑潜蝇Epicauta Gorhami的幼虫以土壤中的蝗卵为食，进行变态。这种甲虫在五龄幼虫中以伪蛹的形式经历滞育，这是甜菜夜蛾超变态的一种形式。如果幼虫在持续的短日滞育条件下滞育，这种假性滞育可以维持很长一段时间。本研究以25℃、12L-12D条件下获得的假性滞育为材料，研究了温度和光周期对褐飞虱假性滞育终止的影响。滞育通过暴露在低温或高温下而不是转移到长日照条件下终止。拟生殖阶段包括滞育和滞育后阶段，尽管其外观不变。滞育终止的最适低温为10-15℃，温度过高或过低效果较差。滞育终止的低温要求存在个体差异，滞育后发育可能直到满足这一要求才会发生。虽然在自然条件下，不同日龄的伪蜂可能会遇到对滞育终止有效的低温，但我们的结果表明，不同日龄的伪蜂对低温的反应相似。这一反应可确保在人口中同步恢复发展。(C)爱思唯尔有限公司出版的2012年。
Larvae of the bean blister beetle, Epicauta gorhami (Coleoptera: Meloidae), feed on grasshopper eggs in soil and undergo hypermetamorphosis. This beetle undergoes larval diapause in the fifth instar as a pseudopupa, a form characteristic of hypermetamorphosis in meloid beetles. This pseudopupal diapause is maintained for a long period if the larvae are kept under continuous diapause-inducing short-day conditions. In the present study, the effects of temperature and photoperiod on termination of pseudopupal diapause in E. gorhami were examined using pseudopupae obtained under 12L-12D at 25 degrees C. Diapause was terminated by exposure to low or high temperature, but not by transfer to long-day conditions. The pseudopupal stage comprises diapause and post-diapause phases despite its unchanging appearance. The optimum low temperature for diapause termination was 10-15 degrees C, and a higher or lower temperature was less effective. There was an individual variation in the low temperature requirement for diapause termination and post-diapause development may not occur until this requirement is satisfied. Although under natural conditions pseudopupae may encounter low temperatures that are effective for diapause termination at different ages, our results show that pseudopupae at various ages respond similarly to low temperature exposure. This response may ensure that resumption of development synchronizes in a population. (C) 2012 Published by Elsevier Ltd.