烟粉虱及海氏桨角蚜小蜂对中国番茄黄化曲叶病毒感染烟草的嗅觉反应

双生病毒可通过调控寄主植物促进媒介昆虫烟粉虱种群增长,然而病毒侵染植物后是否通过调控植物挥发物来影响烟粉虱及其天敌的嗅觉反应还未见报道。【目的】本文旨在研究烟草植株感染中国番茄黄化曲叶病毒(Tomato yellow leaf curl China virus,TYLCCNV)后对烟粉虱Bemisia tabaci(Gennadius)及其重要寄生性天敌海氏桨角蚜小蜂Eretmocerus hayati(Zolnerowich and Rose)嗅觉反应行为的影响。【方法】利用Y形嗅觉仪方法,我们测试了烟粉虱及海氏桨角蚜小蜂对带毒植株、健康植株及烟粉虱危害植株的选择偏好性。【结果】烟粉虱及海氏桨角蚜小蜂选择携带TYLCCNV病毒的烟草显著多于健康烟草植株,但烟草被病毒与烟粉虱共同侵染时,烟粉虱对带毒烟草的选择仍显著多于无毒植株,而寄生蜂虽然仍较多选择带毒植株,但无显著差异。【结论】这些结果表明烟粉虱及海氏桨角蚜小蜂偏好选择携带TYLCCNV病毒的烟草,但这种偏好作用在烟粉虱取食共同危害时有一定程度的减弱。本研究首次报道了双生病毒侵染植物可增加烟粉虱及其天敌对植物的选择作用,并就其功能及机制进行了讨论。

Olfactory responses of the whitefly Bemisia tabaci and its parasitoid Eretmocerus hayati to tobacco infected by the Tomato yellow leaf curl China virus

Begomoviruses can manipulate host plants to promote the population growth of the whitefly vector Bemisia tabaci （Gennadius）. However, olfactory responses of the whitefly and its parasitoids to virus-infected plants have not been explored. Objectives and Methods] In this study, we used a Y shape olfactometer to investigate the influence of the Tomato yellow leaf curl China virus （TYLCCNV） on olfactory responses of the whitefly and its parasitoid, Eretmocerus hayati （Zolnerowich and Rose）. Results and Conclusion] The results show that B. tabaci and its parasitoid preferred TYLCCNV-infected tobacco plants to non-viruliferous plants. However, this preference declined somewhat when tobacco plants were simultaneously infested by the virus and the whitefly. To our knowledge, this is the first evidence that begomovirus-infection can increase the attractiveness of plants to both the virus vector B. tabaci and this vector＇s parasitoid. The function and mechanisms of this attraction are discussed.