烟夜蛾和棉铃虫对高浓度烟草挥发物的电生理和行为反应

Electrophysiological and behavioral responses of Helicoverpa assulta (Guenée) and H. armigera (Hübner) (Lepidoptera:Noctuidae) to tobacco volatile compounds of high concentration

寡食性的烟夜蛾Helicoverpa assulta(Guene)和广食性的棉铃虫H.armigera(Hbner)是夜蛾属Heliothis的两近缘种昆虫。主要的农作物中,棉花和番茄上极少发现烟夜蛾,而辣椒上几乎没有棉铃虫,只有烟草均为二者所嗜食,也唯独在烟草上它们可以稳定共存。为明确植物挥发物对昆虫寄主定向和选择行为的影响,本文运用触角电位(EAG)和风洞技术,测定了两种夜蛾的处女雌蛾、交配雌蛾及雄蛾对20种高浓度(0.1mol/L)烟草挥发物的电生理和行为反应。结果表明:烟夜蛾和棉铃虫对测试的烟草挥发物均可产生EAG反应,而且都表现出绿叶气味>脂类和芳香化合物>单萜、倍半萜和杂环化合物的总体反应趋势;两种夜蛾对多数化合物的EAG反应既无显著的种内性别差异,也无显著的种间差异,表明二者嗅觉神经系统对寄主气味图谱的识别和感受能力具有一定的相似性,可对寄主植物的化学信息产生相同的"理解";二者的行为反应结果与EAG反应结果基本一致,即两种夜蛾受到的嗅觉刺激与产生的行为反应具有统一性,结合两种夜蛾寄主范围的差异,推测烟草挥发物主要影响两种夜蛾的寄主定向行为,而寄主选择行为可能更依赖于二者与植物接触后对植物理化性质的评价过程。

Oligophagous Helicoverpa assulta(Guenée)and polyphagous H.armigera(Hübner)are two sibling species of Heliothis.In crops,H.assulta was rarely found in cotton or tomato fields,and there was almost no H.armigera on hot pepper,only tobacco was the host plant which both of them preferred to and coexisted on.In order to further understand the effects of plant volatiles on insects host orientation and selection behavior,the electroantennograms(EAGs)and wind tunnel response of virgin females,mated females,and male...