Uptake, translocation, and metabolism of MG-191 safener in corn (Zea mays L.)

摘要: The time-dependent uptake, translocation, and metabolism of [14C]MG-191 safener the influence EPTC on these processes were studied using 5-d-old corn seedlings grown in nutrient solution. Plants absorbed relatively low levels root-applied radiolabel at both 10 KuM 50 ,uM rates durimg 6 d exposure. Amounts radioactivity increased with time. Addition FM EPTC, general, did not alter amounts taken up. Initial translocation from roots to shoots was more rapid treatment compared ,uM. had no effect movement either rate. MG-191 metabolized rapidly water-soluble metabolites. Slower formation products detected only during initial 3 h presence EPTC. Also, thin-layer chromatographic analyses waterand hexane-soluble metabolite fractions confirmed transformation parent molecule. Because addition retarded after treatment, we assume that availability molecule may be prerequisite its protective effect. Nomenclature: MG-191, 2-dichloromethyl-2-methyl1,3-dioxolane; S-ethyl dipropylthiocarbamate; corn, Zea mays L. 'Pioneer 3737.' Additional index words: safener.