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To investigate the mode of safening action of dimepiperate (S-1-methyl-1-phenylethyl piperidine-1-carbothioate) on clomeprop (2-(2, 4-dichloro-3-methylphenoxy) propionanilide) injury to 7-day-old rice seedlings, the effect of dimepiperate on absorption, translocation and metabolism of clomeprop in the plants was determined. Growth of shoots was reduced to 81% of non-treated control by clomeprop at the concentration of 10-6M and mixed treatment with 10-5M dimepiperate reversed this clomeprop-induced inhibition. A lower absorption rate of clomeprop was detected in dimepiperate-treated seedlings. Dimepiperate neither affected translocation of -14C-clomeprop from roots to shoots nor enhanced clomeprop metabolism to DMPA (2-(2, 4-dichloro-3-methylphenoxy) propionic acid) in the plants. In roots of dimepiperate-treated rice plants, however, amount of the herbicidally active compound, DMPA was slightly decreased and that of the non-phytotoxic compound, 2-(2, 4-dichloro-3-hydroxymethylphenoxy) propionic acid (3-CH2OH-DMPA), was increased compared with dimepiperate untreated plants.These results suggest that the safening action of dimepiperate against clomeprop injury in rice seedlings may be due to decreased absorption of the herbicide, and in part, to the metabolism of DMPA to non-phytotoxic metabolite.

Mechanism of Safening Action of Dimepiperate on Clomeprop Injury in Rice Seedlings.