Loss of trifluralin metabolic resistance in Lolium rigidum plants exposed to prosulfocarb recurrent selection

BACKGROUND Resistance to the dinitroaniline herbicide trifluralin in Lolium rigidum (annual ryegrass) often is mediated by the enhanced capacity to metabolize the herbicide to less toxic polar conjugates and/or by functionally recessive target‐site mutations in α‐tubulin. RESULTS In two L. rigidum populations possessing enhanced trifluralin metabolism, resistance was largely reversed by recurrent selection with the thiocarbamate herbicide prosulfocarb (i.e. plant survival was two‐ to >20‐fold lower). Their ability to metabolize trifluralin was significantly decreased (by ≈2.3‐fold) following recurrent prosulfocarb selection, to levels comparable to those observed in susceptible plants or when trifluralin metabolism was inhibited by treatment with the insecticide phorate. CONCLUSIONS This study … Continue reading Loss of trifluralin metabolic resistance in Lolium rigidum plants exposed to prosulfocarb recurrent selection