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Initial Metabolism of Acetochlor in Tolerant and Susceptible Seedlings

Published online by Cambridge University Press:  12 June 2017

E. Jay Breaux
E. Jay Breaux*
Affiliation:
Monsanto Agricultural Products Co., St. Louis, MO 63167
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Abstract

The initial metabolism of acetochlor [2-chloro-N-(ethoxymethyl)-N-(2-ethyl-6-methylphenyl)acetamide] in tolerant and susceptible plants was examined to determine if metabolism is a factor in the selective phytotoxicity of this herbicide. Six crop and ten weed species were used. In every case acetochlor was converted initially to thioether conjugates. In thirteen of the species, initial conjugation was with glutathione (GSH). The homoglutathione (hGSH) conjugate was formed in three legumes. Tolerant plant seedlings metabolized acetochlor more readily than susceptible plant seedlings. Based on these results, acetochlor detoxification is a primary factor in the selective phytotoxicity of this herbicide.

Keywords

Chloroacetanilide selectivityherbicide detoxificationherbicide metabolismZea maysGlycine maxIpomoea purpureaConvolvulus arvensisPhaseolus aureusXanthium pensylvanicumAbutilon theophrastiCassia obtusifoliaSesbania exaltataBrassica kaberMedicago sativaCyperus esculentusSorghum bicolorTriticum aestivumEchinochloa crus-galliIPOPUCONARXANPEABUTHCASOBSEBEXBRAKACYPESSORVUECHCG
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 35 , Issue 4 , July 1987 , pp. 463 - 468
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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