| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 2009261 | Pesticide Biochemistry and Physiology | 2014 | 6 Pages |
•Lujiang population was 199.8/76.2-fold resistant to fenoxaprop/pinoxaden.•A Trp2027Cys mutation was found in CT domain of ACCase of resistant population.•The Trp2027Cys mutation was the molecular mechanism of resistance to fenoxaprop.•A rapid and accurate dCAPS method was built to detect the 2027Cys mutation.
American sloughgrass (Beckmannia syzigachne) is a troublesome weed in winter wheat field rotated with rice in China. Fenoxaprop-p-ethyl and pinoxaden were observed failing to control American sloughgrass in the same filed in Lujiang county in 2011 and 2012, respectively. Whole-plant bioassay was conducted to determine the resistance to fenoxaprop-p-ethyl, pinoxaden and other herbicides in American sloughgrass. Dose–response experiment indicated that Lujiang population was highly resistant to fenoxaprop-p-ethyl (199.8-fold), pinoxaden (76.2-fold), clodinafop-propargyl (334.1-fold) and sethoxydim (15.9-fold); moderately resistant to clethodim (6.3-fold), susceptible to mesosulfuron-methyl, flucarbazone-sodium, pyroxsulam and isoproturon. Partial gene of CT domain was cloned and sequenced to confirm the molecular mechanism of resistance to ACCase-inhibiting herbicides. A Trp2027Cys mutation was found in Lujiang population according to the sequencing result. This mutation is the molecular mechanism of resistance to fenoxaprop-p-ethyl in Lujiang population. Furthermore the Trp2027Cys mutation very likely results in cross resistance to clodinafop-propargyl and pinoxaden in Lujiang population. 103 mutant homozygotes were detected from the 108 plants tested using a rapid dCAPS method developed in this paper. This is the first report of pinoxaden resistance and a mutation at position of 2027 for American sloughgrass.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide
