虫害诱导烟草抗性对斜纹夜蛾生长和产卵选择的影响

Effects of herbivore induced tobacco resistance on developmental performances and oviposition preference of Spodoptera litura

【目的】探究不同品种烟草的虫害诱导抗性对斜纹夜蛾生长和产卵选择的影响。【方法】选取了野生种的八旦野生烟、地方品种的梁桥晒烟和选育品种的湘烟5号3个烟草品种,测试斜纹夜蛾幼虫取食不同品种烟草的对照组和虫害处理组后的生活史参数;观察斜纹夜蛾成虫对不同品种烟草的产卵选择偏好性。【结果】斜纹夜蛾幼虫取食诱导的烟草,对后续再取食的斜纹夜蛾存活率、发育历期、蛹质量、蛹期、羽化率和成虫体质量产生了不利影响,例如,虫害处理组的斜纹夜蛾存活率、蛹质量较对照组显著降低,两者分别相差1.27~2.60倍、1.25~1.54倍,这一不利影响在野生种和地方品种烟草上表现的更为明显。斜纹夜蛾成虫对不同烟草品种的产卵选择偏好性存在差异,其中最偏好在选育品种上产卵,其次为地方品种,最不喜野生种,且虫害处理组的产卵选择率均显著低于对照组。【结论】虫害诱导烟草抗性对斜纹夜蛾的生长和产卵选择产生了不利影响。

This study aims to explore the effects of herbivore induced tobacco resistance on the developmental performances and oviposition preference of Spodoptera litura.Three tobacco varieties were selected as research objects in this study,including wild varieties of Badan wild tobacco,local varieties of Liangqiao sun cured tobacco,bred varieties of Xiangyan 5.The developmental performances and oviposition preference of S.litura fed on different varieties of tobacco in control and pest treatment group were tested.The herbivore induced tobacco resistance had negative effects on the survival rate,development duration,pupa mass,pupa stage,pupa ecosion rate,and adult dry mass of S.litura.For example,survival rate,pupa mass in the pest treatment group were significant lower than those in the control group by 1.27-2.60 times and 1.25-1.54 times,respectively.Such adverse effects were stronger in wild and local varieties.The oviposition preference of S.litura varied significantly with tobacco varieties.S.litura adults preferred to oviposit on bred varieties,the rate was highest than local and wild varieties,and the adult celection rate of control group was higher than herbivore-induced group.It can be concluded that herbivore induced tobacco resistance had negative effects on the developmental performances and oviposition preference of S.litura.