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Bentazon Metabolism in Tolerant and Susceptible Soybean (Glycine max) Genotypes

Published online by Cambridge University Press:  12 June 2017

James A. Connelly ,
Michael D. Johnson ,
John W. Gronwald  and
Donald L. Wyse
James A. Connelly
Affiliation:
Dep. Agron. and Plant Genetics, Univ. Minnesota, St. Paul, MN 55108
Michael D. Johnson
Affiliation:
Dep. Agron. and Plant Genetics, Univ. Minnesota, St. Paul, MN 55108
John W. Gronwald
Affiliation:
Dep. Agron. and Plant Genetics, Univ. Minnesota, St. Paul, MN 55108
Donald L. Wyse
Affiliation:
Dep. Agron. and Plant Genetics, Univ. Minnesota, St. Paul, MN 55108
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Abstract

Previous reports have suggested that bentazon [3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide] tolerance among soybean genotypes is the result of differential translocation or metabolism. The basis for tolerance was reexamined using susceptible and tolerant genotypes. Tolerant genotypes (‘Hill’ and ‘Clark 63’) were found to tolerate 100- to 300-fold more bentazon than susceptible genotypes (‘L78–3263’, ‘Hurrelbrink’, and ‘PI 229.342’). Minor differences in absorption and translocation occurred among the genotypes but they did not correlate with tolerance. Tolerant genotypes metabolized 80 to 90% of absorbed bentazon within 24 h, while susceptible genotypes metabolized only 10 to 15%. Two major metabolites, the glycosyl conjugates of 6- and 8-hydroxybentazon, were formed in tolerant genotypes. Susceptible genotypes did not form the hydroxybentazon conjugates but instead produced relatively low levels of two unidentified metabolites. It is concluded that differential bentazon tolerance among soybean genotypes is linked to the ability to form both the 6- and 8-hydroxybentazon conjugates.

Keywords

Herbicide absorptionherbicide translocation
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 36 , Issue 4 , July 1988 , pp. 417 - 423
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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