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Bt protein hasten entomopathogenic fungi-induced death of nontarget pest whitefly by suppressing protective symbionts br

文献类型： 外文期刊

作者： Zhao, Dongxiao 1 ; Ni, Xiaolu 1 ; Zhang, Zhichun 1 ; Niu, Hongtao 1 ; Qiu, Ruiting 2 ; Guo, Huifang 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Plant Protect, 50 Zhongling St, Nanjing 210014, Peoples R China

2.Ohio State Univ, Coll Arts & Sci, Columbus, OH 43201 USA

关键词： Bt protein; Symbiont; Nontarget pest; Entomopathogenic fungus

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 853 卷

页码：

收录情况： SCI

摘要： The risk assessment of Bacillus thuringiensis(Bt) crops on nontarget pests has received much attention. Despite the knowledge of various beneficial bacterial symbionts in pests, whether Bt proteins affect these symbionts and subse-quently alter the pest's ecology remains largely unknown. The whiteflyBemisia tabaciis one of the most serious non-target pests in Bt cotton. Here, we explored the BtCry1Acprotein-induced changes in whitefly symbiont abundance and the subsequent effects on whitefly response against a naturally prevalent entomopathogenic fungusCordycepsjavanica. The obligate symbiont'CandidatusPortiera aleyrodidarum'(hereafterP. aleyrodidarum) as well as facultativesymbionts'Candidatus Hamiltonella defensa'(hereafterH. defensa),'Candidatus Cardinium hertigii'(hereafterC. hertigii)and'Candidatus Rickettsia bellii'(hereafterR. bellii) dominate the microbial community of whiteflies. The Bt exposurehad no effects onH. defensainfected (H) andH. defensa-C. hertigiidoubly infected (HC) whiteflies, but decreasedthe total copy number of symbionts as well as theR. belliiproportion inH. defensa-C. hertigii- R. belliitriply infectedwhiteflies (HCR).C. javanicacaused whitefly adults 100 % mortality within 8 days. Without Bt protein exposure,HCR whiteflies survived significantly longer than H and HC whiteflies sprayed byC. javanica, suggesting thatR. belliiconfers protection. However, in Bt-exposed groups,C. javanicagenerated synchronous death of H, HC andHCR whiteflies. Specifically, in H and HC whiteflies, Bt protein-exposure showed no significant difference in progressof death caused byC. javanica.ButinHCRwhiteflies, Bt exposure hastened death induced byC. javanica,suppressingtheR. bellii-conferred protection. This is the first report revealing that Bt protein altered symbiont community con-ferred adverse effects on nontarget pests, providing a new perspective for Bt risk assessment and biocontrol strategies of nontarget pests

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