Selective Mechanism of Cyhalofop-butyl ester between Rice(Oryzae sativa L.) and Echinochloa crus-galli - III. Uptake, Translocation, and Metabolism, of 14 C-cyhalofop-butyl ester

This experiment was conducted to determine the selective mechanism of cyhalofop-butyl ester on uptake, traslocation, and metabolism of the herbicide in both rice and Echinochloa crus-galli. Uptake and translocation of -cyhalofop-butyl ester was higher in E. crus-galli than rice when treated to shoot. -uptake by root of E. crus-galli increased rapidly at 30 minute after treatment and reached the maximum at 12 hoots after treatment. After that, uptake was leveled off. Uptake pattern in rice root was not significantly affected by the duration of herbicide treatment. In E. crus-galli, the absorbed -cyhalofop-butyl ester seemed to be rapidly metabolized into free acid and the content of changed free acid was higher than rice.