チオクロルメチル〔3-(3-chloro-4-chlorodifluoromethylthiophenyl)-1, 1-dimethylurea〕の選択殺草機構 : 2. 代謝

概要

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Metabolism of both foliar and root applied thiochlormethyl in rice, barnyardgrass, cucumber and tomato plants was investigated to clarify the mechanism of its selectivity. In root application, difference in the rates of metabolism among those plants tested was observed a little, and suggested to be little concerned with the selectivity. On the other hand, in foliar application, thiochlormethyl was metabolized quickly in foliar tissue, and the differential rates of metabolism was shown remarkably among those plants. It was metabolized more rapidly in rice (tolelant) than in barnyardgrass (intermediate) or tomato (susceptible). N-methyl-^<14>C-labeled thiochlormethyl was used for metabolism studies. Demethyl thiochlormethyl, thiochlormethyl sulfoxide, thiochlormethyl sulfone, demethyl thiochlormethyl sulfoxide and demethyl thiochlormethyl sulfone were identified as main metabolites. From the time course study of metabolism, metabolic pathways including N-demethylation and S-oxidation are proposed. In these metabolites, thiochlormethyl sulfoxide and sulfone showed considerable herbicidal activity, while other metabolites showed little.
日本雑草学会の論文
1977-07-25