Unprecedented oviposition tactics avoid plant defences and reduce attack by parasitic wasps

粘虫 生物 寄生蜂 幼虫 植物 食草动物 有害生物分析 生殖器鳞翅目 夜蛾科 昆虫
作者
Jin‐Hua Shi,Ze Sun,John A. Pickett,Xinjun Hu,Chao Wang,Le Liu,Huanan Jin,Hazem Abdelnabby,Caroline Ngichop Foba,Xue Yang,Xiang‐Qian Chang,Man‐Qun Wang
出处
期刊:Plant Cell and Environment [Wiley]
卷期号:47 (1): 308-318 被引量:2
标识
DOI:10.1111/pce.14731
摘要

Female insects oviposit in sites suitable for the development of their offspring. The Oriental armyworm, Mythimna separata is a serious pest of various crops including wheat and prefers to oviposit on withered leaves rather than on fresh plant material, which is surprisingly different from other insects. Studies here showed that this oviposition tactic enables avoidance of wheat defence against eggs and emerged larvae. Intact plants responded to M. separata egg deposition by releasing oviposition-induced plant volatiles including acetophenone, tetradecene and pentadecane after 24 h. Acetophenone was identified as quantitatively accounting for the attraction of the egg parasitoid wasp (Trichogramma chilonis). Leaf jasmonic acid levels significantly increased after M. separata laid eggs, and primed the plant against emerging larvae. In addition, newly emerged M. separata larvae adopted a fast crawling behaviour and starvation tolerance compared with other noctuid larvae, which enhanced the survival of larvae on the withered leaves. The elucidation of this complex and surprising plant-insect interaction provides the first explanation for a herbivore laying eggs on withered leaves to avoid natural enemies and live-plant defence against emerging larvae.
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