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Palmer Amaranth (Amaranthus palmeri) in Tennessee Has Low Level Glyphosate Resistance

Published online by Cambridge University Press:  20 January 2017

Lawrence E. Steckel ,
Christopher L. Main ,
Andrew T. Ellis  and
Thomas C. Mueller
Lawrence E. Steckel
Affiliation:
Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996 USA
Christopher L. Main
Affiliation:
Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996 USA
Andrew T. Ellis
Affiliation:
Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996 USA
Thomas C. Mueller*
Affiliation:
Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996 USA
*
Corresponding author's E-mail: [email protected]
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Abstract

Many agricultural producers apply glyphosate to glyphosate-resistant crops to control weeds, including Palmer amaranth. Populations of this weed in Tennessee not completely controlled by glyphosate were examined. Field and greenhouse research confirmed that two separate populations had reduced biomass sensitivity (1.5× to 5.0×) to glyphosate compared to susceptible populations, although the level of resistance was higher based on plant mortality response (about 10×). Shikimate accumulated in both resistant and susceptible plants, indicating that 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) was inhibited in both biotypes. These results suggest that an altered target site is not responsible for glyphosate resistance in these Palmer amaranth biotypes.

Keywords

GlyphosatePalmer amaranth, Amaranthus palmeri S. Wats. AMAPAHerbicide resistancegenetically-modified cropscotton
Type
Research
Information
Weed Technology , Volume 22 , Issue 1 , March 2008 , pp. 119 - 123
Copyright
Copyright © Weed Science Society of America 

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