Pupal diapause of Helicoverpa armigera:: sensitive stage for photoperiodic induction
Pupal diapause of Helicoverpa armigera:: sensitive stage for photoperiodic induction
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DOI：
10.1303/aez.2005.457
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发表时间：
2005-08-01
影响因子：
1.3
通讯作者：
Tsumuki, H
中科院分区：
文献类型：
--
作者：
Kurban, A;Yoshida, H;Tsumuki, H
棉铃虫表现为兼性蛹滞育，这取决于温度和光周期。在20℃时，短光周期诱导蛹滞育，长光周期抑制蛹滞育。通过不同龄期的幼虫在长、短光周期间的转移，确定了光周期诱导蛹滞育的敏感期。在20℃的短光周期条件下，将卵至4龄的幼虫转入5龄早期的长光周期条件下，不诱导滞育。然而，当幼虫在5龄中期转移到较长的光周期时，会诱导滞育。另一方面，将卵- 4龄长光周期饲养的幼虫转入5龄早期短光周期饲养的幼虫，约有80% ~ 100%的蛹进入滞育。上述结果表明，尽管光周期对三、四龄幼虫的滞育有一定影响，但五龄早期是决定蛹滞育的主要敏感期。
Helicoverpa armigera exhibits a facultative pupal diapause, which depends on temperature and photoperiod. Pupal diapause is induced at 20 degrees C by short photoperiods and inhibited by long photoperiods during the larval stage. Sensitive stages for photoperiodic induction of pupal diapause were determined by transferring larvae of various instars between long and short photoperiods. When larvae reared at 20 degrees C under a short photoperiod during egg to fourth instar were transferred to a long photoperiod at the early fifth instar, diapause was not induced. However, when larvae were transferred to a long photoperiod in the middle of fifth instar, diapause was induced. On the other hand, when larvae reared under a long photoperiod during egg to fourth instar were transferred to a short photoperiod at the early fifth instar, about 80 to 100% pupae entered diapause. These results show that the early fifth larval instar is the main sensitive stage for pupal diapause determination even though photoperiod has some effect in the third and fourth instars.