Article ; Online: Target-site and non-target-site resistance mechanisms confer mesosulfuron-methyl resistance in Alopecurus aequalis.
Plant physiology and biochemistry : PPB
2024 Volume 210, Page(s) 108597
Abstract: Background: Shortawn foxtail (Alopecurus aequalis Sobol.) is a noxious weed in China. The resistance of A. aequalis developed rapidly due to the long-term application of acetolactate synthase (ALS)-inhibiting herbicides. Here, a suspected mesosulfuron- ... ...
Abstract | Background: Shortawn foxtail (Alopecurus aequalis Sobol.) is a noxious weed in China. The resistance of A. aequalis developed rapidly due to the long-term application of acetolactate synthase (ALS)-inhibiting herbicides. Here, a suspected mesosulfuron-methyl-resistant A. aequalis population, Aa-R, was collected from a wheat field in China. Results: A dose‒response test showed that the Aa-R population has evolved a high level of resistance to mesosulfuron-methyl, and its growth was suppressed by imazamox, pyroxsulam and bispyribac-sodium. ALS gene sequence analysis revealed that a known resistance-related mutation (Pro-197-Thr) was present in the Aa-R population. Moreover, ALS gene overexpression was detected in the Aa-R population. The mesosulfuron-methyl resistance could be reversed by cytochrome P450 monooxygenase (CYP450) and glutathione S-transferase (GST) inhibitors. In addition, enhanced metabolism of mesosulfuron-methyl was detected in the Aa-R population compared with the susceptible population. NADPH-cytochrome P450 reductase and GST activities were strongly inducible in the Aa-R population. One CYP450 gene, CYP74A2, and one GST gene, GST4, were constitutively upregulated in the Aa-R population. Molecular docking results showed the binding affinity of CYP74A2 and GST4 for the tested ALS-inhibiting herbicides, respectively. Conclusion: This study confirmed that target-site resistance and non-target-site resistance involving CYP450 and GST were the main mechanisms involved in resistance in the mesosulfuron-methyl-resistant A. aequalis population. |
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MeSH term(s) | Herbicide Resistance/genetics ; Sulfonylurea Compounds/pharmacology ; Acetolactate Synthase/genetics ; Acetolactate Synthase/metabolism ; Herbicides/pharmacology ; Poaceae/genetics ; Poaceae/drug effects ; Poaceae/metabolism ; Cytochrome P-450 Enzyme System/genetics ; Cytochrome P-450 Enzyme System/metabolism ; Plant Proteins/genetics ; Plant Proteins/metabolism ; Glutathione Transferase/metabolism ; Glutathione Transferase/genetics ; Imidazoles/pharmacology ; Gene Expression Regulation, Plant/drug effects ; Mutation ; Molecular Docking Simulation ; Benzoates ; Pyrimidines |
Chemical Substances | Sulfonylurea Compounds ; mesosulfuron-methyl (22L00R79A6) ; Acetolactate Synthase (EC 2.2.1.6) ; Herbicides ; Cytochrome P-450 Enzyme System (9035-51-2) ; Plant Proteins ; imazamox (UG6793ON5F) ; Glutathione Transferase (EC 2.5.1.18) ; bispyribac (9W20BD966G) ; Imidazoles ; Benzoates ; Pyrimidines |
Language | English |
Publishing date | 2024-04-04 |
Publishing country | France |
Document type | Journal Article |
ZDB-ID | 742978-2 |
ISSN | 1873-2690 ; 0981-9428 |
ISSN (online) | 1873-2690 |
ISSN | 0981-9428 |
DOI | 10.1016/j.plaphy.2024.108597 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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