Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 66, Issue 37, Pages 9850-9857Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.8b02740
Keywords
abiotic stress; Myosoton aquaticum L.; acetolactate synthase; tribenuron-methyl; metabolic resistance; transcriptomics; molecular mechanisms
Funding
- National Natural Science Foundation of China [31601653, 31772181, 31471424]
- China Postdoctoral Science Foundation [2017M612311]
- National Key Research and Development Program of China [2016YFD0300701]
- Shandong Double Tops Program [SYL2017XTTD11]
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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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