Journal of Integrative Agriculture ›› 2023, Vol. 22 ›› Issue (10): 3090-3102.DOI: 10.1016/j.jia.2023.05.023

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基于CRISPR/Cas9技术的PxABCB1基因功能鉴定揭示了其在小菜蛾对Cry1Ac、阿维菌素和甲维盐抗性中的作用

  

  • 收稿日期:2022-12-15 接受日期:2023-02-28 出版日期:2023-10-20 发布日期:2023-10-07

CRISPR/Cas9-based functional characterization of PxABCB1 reveals its roles in the resistance of Plutella xylostella (L.) to Cry1Ac, abamectin and emamectin benzoate

OUYANG Chun-zheng1, 2*, YE Fan1*, WU Qing-jun1, WANG Shao-li1, Neil CRICKMORE3, ZHOU Xu-guo4, GUO Zhao-jiang1#, ZHANG You-jun1#   

  1. 1 State Key Laboratory of Vegetable Biobreeding, Deapartment of Plant Protection, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
    2 Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, P.R.China
    3 School of Life Sciences, University of Sussex, Brighton BN1 9QG, UK
    4 Department of Entomology, University of Kentucky, Lexington, KY 40546-0091, USA
  • Received:2022-12-15 Accepted:2023-02-28 Online:2023-10-20 Published:2023-10-07
  • About author:OUYANG Chun-zheng, E-mail: ouyangchunzheng12@163.com; YE Fan, E-mail: yefan9605@163.com; #Correspondence GUO Zhao-jiang, Tel: +86-10-82109518, E-mail: guozhaojiang@caas.cn; ZHANG You-jun, E-mail: zhangyoujun@caas.cn * These authors contributed equally to this study.
  • Supported by:
    This work was supported by the Laboratory of Lingnan Modern Agriculture Project, China (NT2021003), the National Natural Science Foundation of China (32022074, 32221004 and 32172458), the Beijing Key Laboratory for Pest Control and Sustainable Cultivation of Vegetables, Chinese Academy of Agricultural Sciences, and the Innovation Program of the Chinese Academy of Agricultural Sciences (CAAS-CSCB-202303).

摘要:

鉴定苏云金芽胞杆菌(Bacillus thuringiensis, Bt)杀虫蛋白的中肠功能性受体对于解析昆虫Bt抗性的分子机制至关重要。前期研究发现,PxABCB1基因的表达下调与小菜蛾(Plutella xylostella)Bt Cry1Ac杀虫蛋白产生抗性密切相关。为了进一步验证PxABCB1是否为小菜蛾Bt Cry1Ac的潜在受体及其Bt Cry1Ac毒性中的作用,我们利用CRISPR/Cas9技术构建了一个纯合突变种群(ABCB1KO),该种群小菜蛾个体中PxABCB1基因的第3外显子区域有5个碱基的缺失。ABCB1KO种群小菜蛾个体对Bt Cry1Ac杀虫蛋白的抗性是敏感种群(DBM1Ac-S)63倍。更有趣的是,ABCB1KO种群小菜蛾个体对阿维菌素和甲维盐的敏感性也显著增加,但未发现其对Bt Cry蛋白或另外种杀虫剂的敏感性变化。而且,ABCB1KO种群不存在明显的适应度代价。综上所述,我们的研究表明PxABCB1既可以保护昆虫免受阿维菌素杀虫剂的伤害,又促进Bt Cry1Ac杀虫蛋白对昆虫的毒作用。这项研究有助于提供针对小菜蛾这种破坏性害虫的综合害虫管理方法

Abstract:

The identification of functional midgut receptors for pesticidal proteins produced by Bacillus thuringiensis (Bt) is critical for deciphering the molecular mechanism of Bt resistance in insects.  Reduced expression of the PxABCB1 gene was previously found to be associated with Cry1Ac resistance in the diamondback moth, Plutella xylostella (L.).  To directly validate the potential receptor role of PxABCB1 and its contribution to Bt Cry1Ac toxicity in Pxylostella, we used CRISPR/Cas9 to generate a homozygous knockout ABCB1KO strain with a 5-bp deletion in exon 3 of its gene.  The ABCB1KO strain exhibited a 63-fold resistance to Cry1Ac toxin compared to the parental DBM1Ac-S strain.  Intriguingly, the ABCB1KO strain also exhibited significant increases in susceptibility to abamectin and emamectin benzoate.  No changes in susceptibility to various other Bt Cry proteins or synthetic insecticides were observed.  The knockout strain exhibited no significant fitness costs.  Overall, our study indicates that PxABCB1 can protect the insect against avermectin insecticides on one hand, while on the other hand it facilitates the toxic effect of the Bt Cry1Ac toxin.  The results of this study will help to inform integrated pest management approaches against this destructive pest.

Key words: Bacillus thuringiensis ,  Plutella xylostella ,  CRISPR/Cas9 ,  ABCB1 ,  bioinsecticide resistance