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Uptake, Translocation, and Metabolism of MG-191 Safener in Corn (Zea Mays L.)

Published online by Cambridge University Press:  12 June 2017

István Jablonkai  and
Ferenc Dutka
István Jablonkai
Affiliation:
Dep. for Pestic. Res., Central Res. Inst. for Chemistry, Hungarian Academy of Sciences, P.O. Box 17, H-1525 Budapest, Hungary
Ferenc Dutka
Affiliation:
Dep. for Pestic. Res., Central Res. Inst. for Chemistry, Hungarian Academy of Sciences, P.O. Box 17, H-1525 Budapest, Hungary
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Abstract

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

Keywords

MG-191,2-dichloromethyl-2-methyl-1,3-dioxolaneEPTC, S-ethyl dipropylthiocarbamatecorn, Zea mays L. ‘Pioneer 3737.’MG-191EPTCsafener
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 43 , Issue 2 , June 1995 , pp. 169 - 174
Copyright
Copyright © 1995 by the Weed Science Society of America 

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