数字农科院2.0

Transcriptomic Responses To Different Cry1Ac S.election Stresses In Helicoverpa A rmigera

文献类型： 外文期刊

作者： An, Shiheng;Du, Mengfang;Yang, Shuo;Liu, Xiaoguang;Chen, Lin;Liang, Gemei;Wei, Jizhen

作者机构：

关键词： Helicoverpa armigera; DGE; Cry1Ac; trypsin; receptors; mechanisms of resistance

期刊名称： FRONTIERS IN PHYSIOLOGY

ISSN： 1664-042X

年卷期： 2018 年 9 卷

页码：

收录情况： JCR（2021版）

摘要： Helicoverpa armigera can develop resistance to Bacillus thuringiensis (Bt), which threaten the long-term success of Bt crops. In the present study, RNAseq was employed to investigate the midgut genes response to strains with different levels of resistance (LF5, LF10, LF20, LF30, LF60, and LF120) in H. armigera. Results revealed that a series of differentially expressed unigenes (DEGs) were expressed significantly in resistant strains compared with the LF-susceptible strain. Nine trypsin genes, ALP2, were downregulated significantly in all the six resistant strains and further verified by qRT-PCR, indicating that these genes may be used as markers to monitor and manage pest resistance in transgenic crops. Most importantly, the differences in DEG functions in the different resistant strains revealed that different resistance mechanisms may develop during the evolution of resistance. The immune and detoxification processes appear to be associated with the low-level resistance (LF5 strain). Metabolic process-related macromolecules possibly lead to resistance to Cry1Ac in the LF10 and LF20 strains. The DEGs involved in the "proton-transporting V-type ATPase complex" and the "proton-transporting two-sector ATPase complex" were significantly expressed in the LF30 strain, probably causing resistance to Cry1Ac in the LF30 strain. The DEGs involved in binding and iron ion homeostasis appear to lead to high-level resistance in the LF60 and LF120 strains, respectively. The multiple genes and different pathways seem to be involved in Cry1Ac resistance depending on the levels of resistance. Although the mechanisms of resistance are very complex in H. armigera, a main pathway seemingly exists, which contributes to resistance in each level of resistant strain. Altogether, the findings in the current study provide a transcriptome-based foundation for identifying the functional genes involved in Cry1Ac resistance in H. armigera.

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