数字农科院2.0

Pro-197-Ser Mutation Inalsand High-Level Gst Activities: Multiple Resistance To Als And Accase Inhibitors Inbeckmannia Syzigachne

文献类型： 外文期刊

作者： Wang, JJ; Chen, JC; Li, XJ; Li, D; Li, Z; Cui, HL

作者机构：

关键词： Herbicide Resistance; Weeds; Metabolism; Rna-Seq; Overexpression

期刊名称： FRONTIERS IN PLANT SCIENCE

ISSN： 1664-462X

年卷期： 2020 年 11 卷

页码：

收录情况： JCR（2021版）

摘要： American sloughgrass (Beckmannia syzigachneSteud.) is one of the most troublesome weeds infesting wheat and canola fields in China. Some biotypes cannot be controlled, either by acetolactate synthase (ALS) or acetyl coenzyme A carboxylase (ACCase) inhibitors, which are the main herbicides for controlling this weed. However, very few studies have investigated multiple resistance mechanism inB. syzigachne. In this study, aB. syzigachnebiotype with a high resistance to ALS inhibitors we have reported was also showed relatively lower resistance to ACCase inhibitors, with a resistance index around 7. RNA-seq analysis was used to investigate the factors responsible for multiple resistance, and 60,108 unigenes were assembled byde novotranscriptome assembly and then annotated across eight databases. A Pro-197-Ser mutation was identified in theALSgene by SNPs analysis and validated by PCR, while no mutation was identified in theACCasegene. Nineteen candidate metabolic genes were screened and their overexpression was confirmed by qPCR. The expression ofGST-T3andGST-U6in resistant plants ranged from 7.5- to 109.4-folds than that in susceptible ones at different times after two kinds of herbicide treatment. In addition, GST activities in resistant plants were 3.0-5.0 times higher than that in susceptible plants. Other novel resistance factors also showed high correlation with multiple resistance which included four genes encoding disease resistance proteins, a transcription factor (MYC3), and one gene conferring blight resistance. In this research, aB. syzigachnebiotype was confirmed to have evolved multiple resistance to ACCase and ALS inhibitors. The Pro-197-Ser mutation inALSgene and high-level GST activities were confirmed responsible for the multiple resistance. Characterized disease-resistance proteins, transcription factor, and blight-resistance proteins may play an essential role in these multiple herbicide resistance.

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