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Physiological Basis for Antagonism of Fluazifop-P by DPX-PE350

Published online by Cambridge University Press:  12 June 2017

Kenneth L. Ferreira ,
James D. Burton  and
Harold D. Coble
Kenneth L. Ferreira
Affiliation:
Dep. Crop Sci., North Carolina State Univ., Raleigh, NC 27695-7620
James D. Burton
Affiliation:
Dep. Hortic. Sci., North Carolina State Univ., Raleigh, NC 27695-7620
Harold D. Coble
Affiliation:
Dep. Hortic. Sci., North Carolina State Univ., Raleigh, NC 27695-7620
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Abstract

Greenhouse and laboratory experiments were conducted to determine the effect of DPX-PE350 on the herbicidal activity of fluazifop-P on large crabgrass. Greenhouse experiments indicated that fluazifop-P activity was antagonized by DPX-PE350. This antagonism was reduced by increasing fluazifop-P rates or by applying DPX-PE350 after fluazifop-P. Applying DPX-PE350 24 h prior to fluazifop-P reduced fluazifop-P activity more than applying it 10 min prior. The effect of DPX-PE350 application to large crabgrass on extractable acetyl-CoA carboxylase activity, and the effect of DPX-PE350 on acetyl-CoA carboxylase activity in vitro also was studied. Applying DPX-PE350 to large crabgrass prior to protein extraction did not reduce fluazifop-P inhibition of acetyl CoA carboxylase activity in vitro. The presence of DPX-PE350 in the enzyme assay mix did not affect fluazifop-P inhibition of acetyl-CoA carboxylase activity. The effect of DPX-PE350 on uptake, translocation, and metabolism of fluazifop-P was considered. DPX-PE350 did not affect uptake of fluazifop-P by large crabgrass. Applying DPX-PE350 24 h prior to fluazifop-P decreased translocation of fluazifop-P out of the treated leaf 44 to 53% whereas mixing DPX-PE350 with fluazifop-P decreased fluazifop-P translocation only 15 to 17%. Metabolism of fluazifop-P was not affected by applications of DPX-PE350. These studies suggest that the antagonism of fluazifop-P activity by DPX-PE350 is due to decreased translocation of fluazifop-P out of the treated leaf.

Keywords

DPX-PE350, sodium 2-chloro-6-(4,5-dimethoxypyrimidin-2-yl-thio)benzoatefluazifop-P, (R)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]-phenoxy]propanoic acidlarge crabgrass, Digitaria sanguinalis (L.) Scop. #3 DIGSAAcetyl-CoA carboxylasemetabolismsite of actiontranslocationuptake
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 43 , Issue 2 , June 1995 , pp. 184 - 191
Copyright
Copyright © 1995 by the Weed Science Society of America 

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