Abstract
A population ofDigitaria sanguinalishas evolved resistance to the herbicide fluazifop-P-butyl following selection with six applications of this herbicide over 4 years. The resistant population is also resistant to the chemically similar aryloxyphenoxypropanoate (APP) herbicides haloxyfop-methyl and quizalofop-P-ethyl, shows a lower level of resistance to the cyclohexanedione (CHD) herbicide sethoxydim, but is not resistant to clethodim. Acetyl-coenzyme A carboxylase isolated from plants of both resistant and susceptible populations was equally sensitive to APP and CHD herbicides. Absorption of [14C]fluazifop-butyl and translocation of14C from [14C]fluazifop-butyl were similar in plants from both populations. Plants of both resistant and susceptible populations rapidly hydrolyzed [14C]fluazifop-butyl to [14C]fluazifop acid in leaves; however, [14C]fluazifop acid was metabolised to other compounds at a more rapid rate in the resistant plants. Enhanced metabolism of the toxophore fluazifop acid is a likely mechanism of resistance in this population.
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