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Selective Action of the New Herbicide 4-amino-6-(1,1-dimethylethyl)-3-(ethylthio)-1,2,4-triazin-5(4H)-one in Different Wheat, Triticum aestivum, Cultivars

Published online by Cambridge University Press:  12 June 2017

Carl Fedtke  and
Robert R. Schmidt
Carl Fedtke
Affiliation:
Bayer AG, Geschäftsbereich Pflanzenschutz, Anwendungstechnik, Biologische Forschung, Pflanzenschutzzentrum Monheim, 5090 Leverkusen, Fed. Rep. of Germany
Robert R. Schmidt
Affiliation:
Bayer AG, Geschäftsbereich Pflanzenschutz, Anwendungstechnik, Biologische Forschung, Pflanzenschutzzentrum Monheim, 5090 Leverkusen, Fed. Rep. of Germany
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Abstract

14C-labeled 4-amino-6-(1,1-dimethylethyl)-3-(ethylthio)-1,2,4-triazin-5(4H)-one (ethiozin)3 was metabolized more rapidly in tolerant than in sensitive wheat, Triticum aestivum L., cultivars. After a 6-h herbicidal pulse, the main metabolites were conjugates at all incubation times up to 48 h. The levels of deaminated and dethioethylated metabolites never exceeded 4% of the extractable radioactivity and also did not differ between tolerant and sensitive plants. On the contrary, 92% of the extractable radioactivity was in conjugates after 24 h in the leaves of tolerant plants compared to 25% in the leaves of sensitive plants. The differently sensitive wheat cultivars conjugated metribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one, at about half the rate that was observed with ethiozin. This finding may explain the fact that most wheat cultivars are more sensitive to metribuzin compared with ethiozin.

Keywords

Herbicide toleranceherbicide selectivityconjugationherbicide metabolism
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 36 , Issue 5 , September 1988 , pp. 541 - 544
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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