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Target-site mutation and enhanced metabolism endow resistance to nicosulfuron in a Digitaria sanguinalis population

文献类型： 外文期刊

作者： Zhao, Bochui 1 ; Xu, Xian 1 ; Li, Binghua 1 ; Qi, Zhizun 1 ; Huang, Jinan 1 ; Hu, Ali 1 ; Wang, Guiqi 1 ; Liu, Xiaomin 1 ;

作者机构： 1.Hebei Acad Agr & Forestry Sci, Inst Cereal & Oil Crops, Key Lab Crop Cultivat Physiol & Green Prod Hebei P, Shijiazhuang 050035, Hebei, Peoples R China

2.Hebei Acad Agr & Forestry Sci, Inst Cereal & Oil Crops, 162 Hengshan St, Shijiazhuang 050035, Hebei, Peoples R China

关键词： Digitaria sanguinalis; Target -site resistance; Metabolic herbicide resistance; Acetolactate synthase; Glutathione S -transferases

期刊名称：PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY （ 影响因子：4.7； 五年影响因子：4.7 ）

ISSN： 0048-3575

年卷期： 2023 年 194 卷

页码：

收录情况： SCI

摘要： Digitaria sanguinalis is a competitive and annual grass weed that commonly infests crops across the world. In recent years, the control of D. sanguinalis by nicosulfuron has declined in Hebei Province, China. To determine the resistance mechanisms of D. sanguinalis to nicosulfuron, a population of D. sanguinalis where nicosulfuron had failed was collected from a maize field of Hebei Province, China. Whole-plant dose-response experiments demonstrated that the resistant population (HBMT-15) displayed 6.9-fold resistance to nicosulfuron compared with the susceptible population (HBMT-5). Addition of the glutathione S-transferase (GSTs) inhibitor 4-chloro-7nitrobenzoxadiazole (NBD-Cl) significantly reduced the resistance level of the HBMT-15 population to nicosulfuron, and the GSTs activity of the HBMT-15 population was higher than the HBMT-5 population after nicosulfuron treatment. In vitro acetolactate synthase (ALS) enzyme experiments revealed that the nicosulfuron I50 value for the HBMT-15 population was 41 times higher than that of the HBMT-5 population. An Asp376 to Glu substitution in the ALS gene was identified in the HBMT-15 population. The HBMT-15 population had a moderate (2- to 4-fold) level of cross-resistance to three other ALS inhibitors (imazethapyr, pyroxsulam, and flucarbazone-sodium), but was susceptible to pyrithiobac-sodium. This study demonstrated that both an Asp376 to Glu substitution in the ALS gene and GSTs-involved metabolic resistance to ALS inhibitors coexisted in a D. sanguinalis population.

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