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Type: Journal article
Title: Mechanism of resistance of evolved glyphosate-resistant Palmer Amaranth (Amaranthus palmeri)
Author: Gaines, T.
Shaner, D.
Ward, S.
Leach, J.
Preston, C.
Westra, P.
Citation: Journal of Agricultural and Food Chemistry, 2011; 59(11):5886-5889
Publisher: Amer Chemical Soc
Issue Date: 2011
ISSN: 0021-8561
Statement of
Todd A. Gaines, Dale L. Shaner, Sarah M. Ward, Jan E. Leach, Christopher Preston and Philip Westra
Abstract: Evolved glyphosate resistance in weedy species represents a challenge for the continued success and utility of glyphosate-resistant crops. Glyphosate functions by inhibiting the plant enzyme 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS). The resistance mechanism was determined in a population of glyphosate-resistant Palmer amaranth from Georgia (U.S.). Within this population, glyphosate resistance correlates with increases in (a) genomic copy number of EPSPS, (b) expression of the EPSPS transcript, (c) EPSPS protein level, and (d) EPSPS enzymatic activity. Dose response results from the resistant and an F(2) population suggest that between 30 and 50 EPSPS genomic copies are necessary to survive glyphosate rates between 0.5 and 1.0 kg ha(-1). These results further confirm the role of EPSPS gene amplification in conferring glyphosate resistance in this population of Palmer amaranth. Questions remain related to how the EPSPS amplification initially occurred and the occurrence of this mechanism in other Palmer amaranth populations and other glyphosate-resistant species.
Keywords: gene amplification
herbicide resistance
transgenic crops
5-enolpyruvylshikimate-3-phosphate synthase (EPSPS)
Palmer amaranth (Amaranthus palmeri S. Wats.)
Rights: Copyright © 2011 American Chemical Society
DOI: 10.1021/jf104719k
Appears in Collections:Agriculture, Food and Wine publications
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