Abstract
Absorption, translocation and metabolism of 2-tert-butyl-4-(2, 4-dichloro-5-isopropoxyphenyl)-Δ2-l, 3, 4-oxadiazolin-5-one (oxadiazon) in rice plants were investigated. Three types of 14C-labeled oxadiazon were used in this study. 14C-Labeled oxadiazon was applied to soil under submerged conditions and plants were taken for the preparations at various stages of growth and development. Oxadiazon was translocated remarkably to shoots and accumulated in the lower leaves and stems. A small portion of oxadiazon intaken in plants was translocated to head parts. Oxadiazon was chemically transformed in plants to produce dealkylated compounds, oxidized alcohol and carboxylic acid as metabolites. In addition, two unidentified metabolites were detected, one of which was translocated to head parts from leaves and stems. Translocation and accumulation of oxadiazon and its metabolites were discussed in relation to physiological conditions of rice plants.
