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Investigation into the Mechanism of Isoxaben Tolerance in Dicot Weeds

Published online by Cambridge University Press:  12 June 2017

Mark A. Schneegurt ,
Dale R. Heim  and
Ignacio M. Larrinua
Mark A. Schneegurt
Affiliation:
Weed Manage., DowElanco, Indianapolis, IN 46268-1053
Dale R. Heim
Affiliation:
Weed Manage., DowElanco, Indianapolis, IN 46268-1053
Ignacio M. Larrinua
Affiliation:
Weed Manage., DowElanco, Indianapolis, IN 46268-1053
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Abstract

Isoxaben is an inhibitor of the synthesis of cellulose from glucose. Some dicot weed species are relatively insensitive to isoxaben inhibition. This study investigates mechanisms by which decreased sensitivity may occur in three dicot weed species: catchweed bedstraw, redroot pigweed, and velvetleaf. Dose response curves were generated to determine I50 values for the inhibition of glucose incorporation into cellulose by isoxaben and compared to that of a sensitive species, mouse-ear cress. Metabolic detoxification and uptake rates were measured and the degree of tolerance conferred by these mechanisms was calculated. In all cases, metabolic detoxification was negligible. Lower uptake rates were significant but minor components of tolerance in all species. It is suggested that the principal cause of isoxaben tolerance in these dicot weed species is decreased sensitivity at the target site.

Keywords

Isoxaben, (N-[3-(1-ethyl-1-methylpropyl)-5-isoxazolyl]-2,6-dimethoxybenzamidecatchweed bedstraw, Galium aparine L. # GALAPmouse-ear cress, Arabidopsis thaliana (L.) Heynh. # ARBTHredroot pigweed, Amaranthus retroflexus L. # AMAREvelvetleaf, Abutilon theophrasti Medik. # ABUTHCellulose biosynthesis inhibitorherbicide toleranceAbutilon theophrastiAmaranthus retroflexusArabidopsis thalianaGalium aparineABUTHAMAREARBTHGALAP
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 42 , Issue 2 , June 1994 , pp. 163 - 167
Copyright
Copyright © 1994 by the Weed Science Society of America 

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References

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