Electrophysiological and Behavioral Responses of Microplitis mediator (Hymenoptera: Braconidae) to Caterpillar-Induced Volatiles From Cotton

文献类型： 外文期刊

第一作者： Zhang, Yongjun

作者： Zhang, Yongjun;Wu, Kongming;Guo, Yuyuan;Wyckhuys, Kris A. G.;Gao, Xiwu

作者机构：

关键词： behavioral experiments;gas chromatography-electroantennographic detection;Microplitics mediator;Helicoverpa armigera;plant volatiles

期刊名称：ENVIRONMENTAL ENTOMOLOGY （ 影响因子：2.377； 五年影响因子：2.298 ）

ISSN： 0046-225X

年卷期： 2010 年 39 卷 2 期

页码：

收录情况： SCI

摘要： Microplitis mediator Haliday (Hymenoptera: Braconidae) is an important larval endo-parasitoid of various lepidopteran pests, including Helicoverpa armigera (Hubner). In China, H. armigera is a key pest of cotton and is currently the focus of several biological control efforts that use M. mediator as principal natural enemy of this pest. To improve the success of biological control efforts, behavioral studies are needed that shed light on the interaction between M. mediator and H. armigera. In this study, we determined M. mediator response to volatile compounds from undamaged, mechanically injured, or H. armigera damaged plants and identified attractive volatiles. In Y-tube olfactometer assays, we found that mechanically damaged plants and/or plants treated with H. armigera oral secretions did not attract wasps. However, volatiles from H. armigera-damaged plants elicited a strong attraction of both M. mediator sexes. Headspace extracts from H. armigera-damaged cotton were analyzed by coupled gas chromatography-electroantennographic detection (GC-EAD), and a total of seven different compounds were found to elicit electroantennogram (EAG) responses, including an unknown compound. Six different EAD-active volatiles were identified from caterpillar-damaged cotton plants, of which 3, 7-dimethyl-1, 3, 6-octatriene and (Z)-3-hexenyl acetate were the principal compounds. Olfactometer assays indicated that individual synthetic compounds of 3, 7-dimethyl-1, 3, 6-octatriene, (Z)-3-hexenyl acetate, and nonanal were attractive to M. mediator. Field cage studies showed that parasitism of H. armigera larvae by M. mediator was higher on cotton plants to which 3,7-dimethyl-1,3, 6-octatriene was applied. Our results show that the combination of terpenoids and green leaf volatiles may not only facilitate host, mate, or food location but may also increase H. armigera parasitism by M. mediator.

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