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• W4310235093 abstract "Resistance of Chinese sprangletop ( Leptochloa chinensis (L.) Nees) to the herbicide cyhalofop-butyl has recently become a severe problem in rice cultivation. However, the molecular mechanisms of target-site resistance (TSR) in cyhalofop-butyl - resistant L. chinensis as well as the underlying non-target-site resistance (NTSR) have not yet been well-characterized. This study aimed to investigate cyhalofop-butyl resistance mechanisms using one susceptible population (LC-S) and two resistant populations (LC-1701 and LC-1704) of L. chinensis. We analyzed two gene copies encoding the entire carboxyltransferase (CT) domain of chloroplastic acetyl-CoA carboxylase (ACCase) from each population. Two non-synonymous substitutions were detected in the resistant L. chinensis populations (Trp 2027 -Cys in the ACCase 1 of LC-1701 and Leu 1818 -Phe in the ACCase 2 of LC-1704), which were absent in LC-S. As Trp 2027 -Cys confers resistance to ACCase-inhibiting herbicides, the potential relationship between the novel Leu 1818 -Phe mutation and cyhalofop-butyl resistance in LC-1704 was further explored by single-nucleotide polymorphism (SNP) detection. Metabolic inhibition assays indicated that cytochrome P450 monooxygenases (P450s) and glutathione S -transferases (GSTs) contributed to cyhalofop-butyl resistance in specific resistant populations. RNA sequencing showed that the P450 genes CYP71Z18 , CYP71C4 , CYP71C1 , CYP81Q32 , and CYP76B6 and the GST genes GSTF11 , GSTF1 , and GSTU6 were upregulated in at least one resistant population, which indicated their putative roles in cyhalofop-butyl resistance of L. chinensis . Correlation analyses revealed that the constitutive or inducible expression patterns of CYP71C4 , CYP71C1 , GSTF1 , and GSTU6 in L. chinensis were strongly associated with the resistant phenotype. For this reason, attention should be directed towards these genes to elucidate metabolic resistance to cyhalofop-butyl in L. chinensis . The findings of this study improve the understanding of mechanisms responsible for resistance to ACCase-inhibiting herbicides in grass-weed species at the molecular level, thus aiding in the development of weed management strategies that delay the emergence of resistance to this class of pest control products." @default.
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• W4310235093 date "2022-11-28" @default.
• W4310235093 modified "2023-09-27" @default.
• W4310235093 title "Diverse mechanisms associated with cyhalofop-butyl resistance in Chinese sprangletop (Leptochloa chinensis (L.) Nees): Characterization of target-site mutations and metabolic resistance-related genes in two resistant populations" @default.
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• W4310235093 doi "https://doi.org/10.3389/fpls.2022.990085" @default.
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