Author:
Campbell James R.,Penner Donald
Abstract
14C-Sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2-ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one} was rapidly metabolized by quackgrass [Agropyron repens(L.) Beauv. ♯ AGRRE], barnyardgrass [Echinochloa crus-galli(L.) Beauv. ♯ ECHCG], alfalfa (Medicago sativaL. ‘Saranac’), and navy bean (Phaseolus vulgarisL. ‘Seafarer’). One hour after application, 46, 27, 38, and 46% of the total14C in the ethyl acetate-soluble fraction from treated leaves was sethoxydim, respectively. After 24 h, less than 2% was sethoxydim in any species. Nine metabolites were found, seven of which cochromatographed with photo- and thermal-transformation products of sethoxydim. Two metabolites, previously shown to be phytotoxic to barnyardgrass, contained the majority of14C up to 24 h after application. Quantitative or qualitative differences in the metabolites of treated leaves could not account for the observed differences in selectivity.
Publisher
Cambridge University Press (CUP)
Subject
Plant Science,Agronomy and Crop Science
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