Enhanced Herbicide Metabolism and Metabolic Resistance Genes Identified in Tribenuron-Methyl Resistant Myosoton aquaticum L

Journal of Agricultural and Food Chemistry
Shuang BaiJinxin Wang

Abstract

The evolved resistance of Myosoton aquaticum L. to acetolactate synthase (ALS) inhibitors is well established, but most research has focused on target-site resistance, while nontarget-site resistance remains neglected. Here, we investigated mechanisms of the latter. The pretreatment with the P450 inhibitor malathion significantly increased the sensitivity of resistant plants to tribenuron-methyl. The rapid P450-mediated tribenuron-methyl metabolism in resistant plants was confirmed by LC-MS/MS analysis. Besides, GST activity was higher among resistant than susceptible individuals. The next transcriptome analysis generated 544,102,236 clean reads from RNA sequencing libraries. De novo assembly yielded 102,529 unigenes with an average length of 866 bp, annotated across seven databases. Digital gene expression selected 25 differentially expressed genes, further validated with qRT-PCR. Three P450 genes, two GST genes, two glucosyltransferase genes, four ABC transporter genes, and four additional contigs were constitutively up-regulated in resistant individuals. Overall, our research confirmed that enhanced herbicide metabolism drives tribenuron-methyl resistance in M. aquaticum.

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Citations

Sep 25, 2019·Plants·Sara L MartinTracey James
Sep 12, 2020·Genome Biology and Evolution·Darci A GiacominiPatrick J Tranel
Apr 18, 2021·Archives of Environmental Contamination and Toxicology·Sevgi Başalan ÖverYusuf Sevgiler
Dec 3, 2021·Journal of Agricultural and Food Chemistry·Candelario Palma-BautistaRafael De Prado

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