Present or Past Herbivory: A Screening of Volatiles Released from Brassica rapa Under Caterpillar Attacks as Attractants for the Solitary Parasitoid, Cotesia vestalis
Present or Past Herbivory: A Screening of Volatiles Released from Brassica rapa Under Caterpillar Attacks as Attractants for the Solitary Parasitoid, Cotesia vestalis
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DOI：
10.1007/s10886-010-9802-6
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发表时间：
2010-06-01
影响因子：
2.3
通讯作者：
Takabayashi, Junji
中科院分区：
文献类型：
--
作者：
Kugimiya, Soichi;Shimoda, Takeshi;Takabayashi, Junji
小菜蛾（Plutella xylostella）是十字花科植物的重要害虫，小菜蛾幼虫侵染植物后，雌蛾对植物释放的挥发性有机化合物（VOCs）产生反应。在实验室条件下，采用二次选择法研究了十字花科植物芜菁对雌性寄生蜂的飞行反应。的寄生蜂更吸引植物已被侵染至少6小时的主机幼虫相比，完整的植物，但他们没有区分植物侵染只有3小时和完整的植物。虽然寄生虫喜欢植物1和2天后，草食动物（以前侵染的植物）在完整的植物，他们也喜欢的植物，已被侵染24小时，以前侵染的植物。这表明，寄生蜂可以区分目前和以前侵染植物的挥发性有机化合物配置文件。我们筛选的治疗之间的VOC排放量的差异，发现苄基氰和二甲基三硫醚的水平显着降低主机幼虫后，而萜类化合物及其相关化合物继续释放在高水平。苯乙腈和二甲基三硫以剂量依赖的方式吸引寄生蜂，而其他化合物没有吸引力。这些结果表明，腈类和硫化物化合物暂时释放的植物攻击下的主机幼虫可能是更有效的引诱剂，这种寄生虫比其他挥发性有机化合物不断释放的主机受损的植物。
Females of the solitary endoparasitoid Cotesia vestalis respond to a blend of volatile organic compounds (VOCs) released from plants infested with larvae of their host, the diamondback moth (Plutella xylostella), which is an important pest insect of cruciferous plants. We investigated the flight response of female parasitoids to the cruciferous plant Brassica rapa, using two-choice tests under laboratory conditions. The parasitoids were more attracted to plants that had been infested for at least 6 hr by the host larvae compared to intact plants, but they did not distinguish between plants infested for only 3 hr and intact plants. Although parasitoids preferred plants 1 and 2 days after herbivory (formerly infested plants) over intact plants they also preferred plants that had been infested for 24 hr over formerly infested plants. This suggests that parasitoids can distinguish between the VOC profiles of currently and formerly infested plants. We screened for differences in VOC emissions among the treatments and found that levels of benzyl cyanide and dimethyl trisulfide significantly decreased after removal of the host larvae, whereas terpenoids and their related compounds continued to be released at high levels. Benzyl cyanide and dimethyl trisulfide attracted parasitoids in a dose-dependent manner, whereas the other compounds were not attractive. These results suggest that nitrile and sulfide compounds temporarily released from plants under attack by host larvae are potentially more effective attractants for this parasitoid than other VOCs that are continuously released by host-damaged plants.