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Sethoxydim Metabolism in Monocotyledonous and Dicotyledonous Plants

Published online by Cambridge University Press:  12 June 2017

James R. Campbell  and
Donald Penner
James R. Campbell
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 44824
Donald Penner
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 44824
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Abstract

14C-Sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2-ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one} was rapidly metabolized by quackgrass [Agropyron repens (L.) Beauv. ♯ AGRRE], barnyardgrass [Echinochloa crus-galli (L.) Beauv. ♯ ECHCG], alfalfa (Medicago sativa L. ‘Saranac’), and navy bean (Phaseolus vulgaris L. ‘Seafarer’). One hour after application, 46, 27, 38, and 46% of the total 14C in the ethyl acetate-soluble fraction from treated leaves was sethoxydim, respectively. After 24 h, less than 2% was sethoxydim in any species. Nine metabolites were found, seven of which cochromatographed with photo- and thermal-transformation products of sethoxydim. Two metabolites, previously shown to be phytotoxic to barnyardgrass, contained the majority of 14C up to 24 h after application. Quantitative or qualitative differences in the metabolites of treated leaves could not account for the observed differences in selectivity.

Keywords

SelectivityAgropyron repensEchinochloa crus-galliMedicago sativaPhaseolus vulgarisAGRREECHCG
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 33 , Issue 6 , November 1985 , pp. 771 - 773
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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