Involvement of bacteria in the development of fungal infections in the Colorado potato beetle  

作　　者：Vadim Yu.Kryukov Elena Kosman Irina Slepneva Yana L.Vorontsova Olga Polenogova Gleb Kazymov Tatyana Alikina Yuriy Akhanaev Darya Sidorenko Yury A.Noskov Anton Krivopalov Marsel R.Kabilov Olga Yaroslavtseva 

机构地区：[1]Institute of Systematics and Ecology of Animals,Siberian Branch of Russian Academy of Sciences,Novosibirsk,Russia [2]Voevodsky Institute of Chemical Kinetics and Combustion,Siberian Branch of Russian Academy of Sciences,Novosibirsk,Russia [3]Novosibirsk State University,Novosibirsk,Russia [4]Institute of Chemical Biology and Fundamental Medicine,Siberian Branch of Russian Academy of Sciences,Novosibirsk,Russia

出　　处：《Insect Science》2025年第2期600-620,共21页昆虫科学(英文版)

基　　金：support from the Russian Science Foundation(No.20-74-10043);continued with the same funding(No.22-14-00309).

摘　　要：Entomopathogenic fungi may interact with insects’symbiotic bacteria during infection.We hypothesized that topical infection with Beauveria bassiana may alter the microbiota of the Colorado potato beetle(CPB)and that these modifications may alter the course of mycoses.We used a model with two concentrations of conidia:(1)high concentration that causes rapid(acute)pathogenesis with fast mortality followed by bacterial decomposition of insects;(2)lower concentration that leads to prolonged pathogenesis ending in conidiation on cadavers.The fungal infections increased loads of enterobacteria and bacilli on the cuticle surface and in hemolymph and midgut,and the greatest increase was detected during the acute mycosis.By contrast,stronger activation of IMD and JAK–STAT signaling pathways in integuments and fat body was observed during the prolonged mycosis.Relatively stable(nonpathogenic)conditions remained in the midgut during both scenarios of mycosis with slight changes in bacterial communities,the absence of mesh and stat expression,a decrease in reactive oxygen species production,and slight induction of Toll and IMD pathways.Oral administration of antibiotic and predominant CPB bacteria(Enterobacteriaceae,Lactococcus,Pseudomonas)led to minor and mainly antagonistic effects in survival of larvae infected with B.bassiana.We believe that prolonged mycosis is necessary for successful development of the fungus because such pathogenesis allows the host to activate antibacterial reactions.Conversely,after infection with high concentrations of the fungus,the host's resources are insufficient to fully activate antibacterial defenses,and this situation makes successful development of the fungus impossible.

关 键 词：Beauveria bassiana GUT IMD INTEGUMENT JAK-STAT MICROBIOTA 

分 类 号：S435.132[农业科学—农业昆虫与害虫防治]