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Type: Journal article
Title: Interspecific hybridization transfers a previously unknown glyphosate resistance mechanism in Amaranthus species
Author: Gaines, T.
Ward, S.
Bukun, B.
Preston, C.
Leach, J.
Westra, P.
Citation: Evolutionary Applications (print), 2012; 5(1):29-38
Publisher: Wiley Blackwell Publishing Inc
Issue Date: 2012
ISSN: 1752-4563
Statement of
Todd A. Gaines, Sarah M. Ward, Bekir Bukun, Christopher Preston, Jan E. Leach and Philip Westra
Abstract: A previously unknown glyphosate resistance mechanism, amplification of the 5-enolpyruvyl shikimate-3-phosphate synthase gene, was recently reported in Amaranthus palmeri. This evolved mechanism could introgress to other weedy Amaranthus species through interspecific hybridization, representing an avenue for acquisition of a novel adaptive trait. The objective of this study was to evaluate the potential for this glyphosate resistance trait to transfer via pollen from A. palmeri to five other weedy Amaranthus species (Amaranthus hybridus, Amaranthus powellii, Amaranthus retroflexus, Amaranthus spinosus, and Amaranthus tuberculatus). Field and greenhouse crosses were conducted using glyphosateresistant male A. palmeri as pollen donors and the other Amaranthus species as pollen recipients. Hybridization between A. palmeri and A. spinosus occurred with frequencies in the field studies ranging from <0.01% to 0.4%, and 1.4% in greenhouse crosses. A majority of the A. spinosus X A. palmeri hybrids grown to flowering were monoecious and produced viable seed. Hybridization occurred in the field study between A. palmeri and A. tuberculatus (<0.2%), and between A. palmeri and A. hybridus (<0.01%). This is the first documentation of hybridization between A. palmeri and both A. spinosus and A. hybridus.
Keywords: 5-enolpyruvyl shikimate-3-phosphate synthase; evolution; evolutionary adaptive change; gene amplification; gene flow; genetic introgression; glyphosate; Palmer amaranth (Amaranthus palmeri S. Wats.); transgenic crops
Rights: © 2011 Blackwell Publishing Ltd. This is an open access article under the terms of the Creative Commons Attribution Non Commercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
RMID: 0020117368
DOI: 10.1111/j.1752-4571.2011.00204.x
Appears in Collections:Agriculture, Food and Wine publications

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