摘  要  【目的】 明确球孢白僵菌Beauveria bassiana定殖玉米Zea mays后，形成的白僵菌-玉米共生体（简称共生体）对亚洲玉米螟Ostrinia furnacalis个体发育的影响及其作用机理。【方法】 采用灌根法构建共生体并饲喂亚洲玉米螟幼虫，探究亚洲玉米螟对气生、芽生孢子共生体的响应（取食量、体重和累积存活率）；统计共生体对亚洲玉米螟保护酶和关键防御基因表达量的影响，明确共生体对亚洲玉米螟的生态调控机理。【结果】 亚洲玉米螟幼虫对球孢白僵菌孢子定殖叶片的取食量存在显著差异，取食后幼虫的体重、累积存活率和体内保护酶（超氧化物歧化酶、过氧化物酶和过氧化氢酶）活性下降，免疫相关基因表达量上调，抗性相关基因表达量下调。【结论】 球孢白僵菌定殖玉米后，能够抑制昆虫取食和生长，并通过调节昆虫保护酶和抗性基因表达量对昆虫产生生态调控作用。

Abstract  [Objectives]  To clarify the effects of Beauveria bassiana−maize symbionts (hereafter, symbionts) on the growth and development of the Asian corn borer (Ostrinia furnacalis). [Methods] Symbionts were constructed using the root-irrigation method and fed to O. furnacalis larvae, after which the food consumption, body weight and cumulative survival rate, of larvae were measured and compared. The effect of symbionts on the expression of protective enzymes and key defensive genes was also analyzed, and the ecological mechanisms underlying the effects of symbionts on larvae were clarified. [Results]  There were significant differences in the consumption by larvae of symbionts compared to uninfected plants. The body weight, cumulative survival rate and protective enzyme activities (SOD, POD and CAT) of larvae decreased after feeding on symbionts, expression of immune-related genes was up-regulated, and expression of resistance-related genes was down-regulated. [Conclusion]  Maize colonized by B. bassiana can inhibit the feeding and growth of O. furnacalis larvae. B. bassiana−maize symbionts can regulate insect development by adjusting the protective enzyme activity of insects, and the expression of genes involved in toxin resistance.