Effects of O-methyl α-( 2,4-dichlorophenoxyacetoxy) methylphosphonate monosodium (WT) on rice budlet and pyruvate dehydrogenase from rice mitochondria were studied with different concentrations of WT in vitro- The result showed that both comparative survival rate of budlet cells and activity of the pyruvate dehydrgenase were increased gradually with the decreases in concentration of WT- The I 50 of WT on pyruvate dehydrogenase is 29-14 μmol·L -1 - It proved that WT a...