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Gene amplification confers glyphosate resistance in Amaranthus palmeri
- T. Gaines, Wenli Zhang, Philip Westra
- Biology, MedicineProceedings of the National Academy of Sciences
- 14 December 2009
This work investigated recently discovered glyphosate-resistant Amaranthus palmeri populations from Georgia, in comparison with normally sensitive populations, and revealed that EPSPS genes were present on every chromosome and, therefore, gene amplification was likely not caused by unequal chromosome crossing over.
Glyphosate resistance: state of knowledge
A model based on finite glyphosate dose and limiting time required for chloroplast loading sets the stage for understanding how uniquely different mechanisms can contribute to overall glyphosate resistance.
RNA-Seq transcriptome analysis to identify genes involved in metabolism-based diclofop resistance in Lolium rigidum.
Four contigs were strongly associated with the resistance phenotype and were consistently highly expressed in nine field-evolved metabolic resistant L. rigidum populations and are major candidates for contributing to metabolic diclofop resistance.
Gene amplification of 5-enol-pyruvylshikimate-3-phosphate synthase in glyphosate-resistant Kochia scoparia
Increased EPSPS expression is a mechanism for glyphosate resistance in these K. scoparia populations, indicating field-evolved resistance to the herbicide glyphosate is due to amplification of one of two EPSPSalleles, increasing transcription and protein with no splice variants or effects on other pathway genes.
Interspecific hybridization transfers a previously unknown glyphosate resistance mechanism in Amaranthus species
- T. Gaines, S. Ward, B. Bukun, C. Preston, J. Leach, Philip Westra
- Biology, MedicineEvolutionary applications
- 23 August 2011
A previously unknown glyphosate resistance mechanism, amplification of the 5‐enolpyruvyl shikimate‐3‐phosphate synthase gene, was recently reported in Amaranthus palmeri, representing an avenue for acquisition of a novel adaptive trait.
Mechanism of resistance of evolved glyphosate-resistant Palmer amaranth (Amaranthus palmeri).
- T. Gaines, D. Shaner, S. Ward, J. Leach, C. Preston, Philip Westra
- Biology, MedicineJournal of agricultural and food chemistry
- 17 February 2011
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).
Evolved Resistance to Glyphosate in Junglerice (Echinochloa colona) from the Tropical Ord River Region in Australia
The evolution of glyphosate resistance in junglerice from a tropical cropping system that included annual tillage further demonstrates the need for improved glyphosate stewardship practices globally.
Phorate can reverse P450 metabolism-based herbicide resistance in Lolium rigidum.
The selective reversal of P450-mediated metabolic multiple resistance to chlorsulfuron and trifluralin in the grass weed L. rigidum is reported by synergistic interaction with the insecticide phorate and the putative mechanistic basis is discussed.
No fitness cost of glyphosate resistance endowed by massive EPSPS gene amplification in Amaranthus palmeri
Both the additive effects of EPSPS gene amplification on the level of glyphosate resistance and the lack of associated fitness costs are key factors contributing to EPS PS gene amplification as a widespread and important glyphosate resistance mechanism likely to become much more evident in weed plant species.
Understanding the potential for resistance evolution to the new herbicide pyroxasulfone: Field selection at high doses versus recurrent selection at low doses
Persistent pyroxasulfone use at low dose has the potential to rapidly lead to herbicide resistance evolution in L. rigidum field populations, and effective stewardship programmes should be developed to minimise the possibility of rapid low-doseinduced resistance evolution and to ensure pyrox asulfone sustainability.