Yin Jin, Sun Yucheng, Ge Feng
State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P. R. China.
1] State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P. R. China [2] Research Network of Global Change Biology, Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing, China.
Sci Rep. 2014 Apr 1;4:4538. doi: 10.1038/srep04538.
Estimating the immunocompetence of herbivore insects under elevated CO2 is an important step in understanding the effects of elevated CO2 on crop-herbivore-natural enemy interactions. Current study determined the effect of elevated CO2 on the immune response of Helicoverpa armigera against its parasitoid Microplitis mediator. H. armigera were reared in growth chambers with ambient or elevated CO2, and fed wheat grown in the concentration of CO2 corresponding to their treatment levels. Our results showed that elevated CO2 decreases the nutritional quality of wheat, and reduces the total hemocyte counts and impairs the capacity of hemocyte spreading of hemolymph of cotton bollworm larvae, fed wheat grown in the elevated CO2, against its parasitoid; however, this effect was insufficient to change the development and parasitism traits of M. mediator. Our results suggested that lower plant nutritional quality under elevated CO2 could decrease the immune response of herbivorous insects against their parasitoid natural enemies.
评估高浓度二氧化碳环境下食草昆虫的免疫能力，是理解高浓度二氧化碳对作物-食草动物-天敌相互作用影响的重要一步。当前研究确定了高浓度二氧化碳对棉铃虫针对其寄生蜂中红侧沟茧蜂免疫反应的影响。将棉铃虫饲养在环境二氧化碳浓度或高浓度二氧化碳的生长室中，并喂食在与其处理水平相应的二氧化碳浓度下种植的小麦。我们的结果表明，高浓度二氧化碳会降低小麦的营养品质，减少棉铃虫幼虫血淋巴的总血细胞计数，并损害其血细胞铺展能力，这些幼虫以在高浓度二氧化碳环境下种植的小麦为食，其针对寄生蜂的免疫能力受到影响；然而，这种影响不足以改变中红侧沟茧蜂的发育和寄生特性。我们的结果表明，高浓度二氧化碳下较低的植物营养品质可能会降低食草昆虫对其寄生性天敌的免疫反应。
