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Bentazon metabolism in tolerant and susceptible soybean (Glycine max) genotypes

Weed Science 36(4): 417-423

Bentazon metabolism in tolerant and susceptible soybean (Glycine max) genotypes

Previous reports have sugessted 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 'PI229.342'). 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, theglycosyl 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.

Accession: 001535762

DOI: 10.2307/4044662

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