Glyphosate resistance in Echinochloa colona: phenotypic characterisation and quantification of selection intensity

Pest Management Science
Sou Sheng GohStephen B Powles

Abstract

A population of Echinochloa colona infesting agricultural fields in the northern region of Western Australia evolved glyphosate resistance after 10 years of glyphosate selection. This study identified two phenotypic (susceptible S versus resistant R) lines from within a segregating glyphosate-resistant population. Estimation of survival, growth and reproductive rates of the phenotypes in response to glyphosate selection helped to characterise the level of resistance, fitness and the selection intensity for glyphosate in this species. Estimations of LD(50) (lethal dose) and GR(50) (growth rate) showed an eightfold glyphosate resistance in this population. The resistant index based on the estimation of seed number (SY(n50)) showed a 13-fold resistance. As a result of linear combination of plant survival and fecundity rates, plant fitness values of 0.2 and 0.8 were estimated for the S and R phenotypes when exposed to the low dose of 270 g glyphosate ha(-1). At the recommended dose of 540 g glyphosate ha(-1) , fitness significantly decreased (fivefold) in S plants but remained markedly similar (0.7) in plants of the R phenotype. Thus, the calculated selection intensity (SI) at 540 g glyphosate ha(-1) was much greater (SI = 17) than...Continue Reading

References

Jan 1, 1994·Critical Reviews in Biochemistry and Molecular Biology·M S JohnsonT L Blundell
Mar 10, 2005·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Paul Neve, Stephen Powles
Jul 2, 2009·Annals of Botany·David F Thornby, Steve R Walker
Sep 29, 2009·The New Phytologist·Paul NeveFabrice Roux
Oct 15, 2009·The New Phytologist·Martin M Vila-AiubStephen B Powles
Mar 3, 2010·Annual Review of Plant Biology·Stephen B Powles, Qin Yu
Dec 21, 2012·Pest Management Science·Martin M Vila-AiubStephen B Powles
Apr 12, 2014·Pest Management Science·Paul NeveMartin M Vila-Aiub

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Citations

Aug 4, 2016·Pest Management Science·Roberto BusiStephen B Powles
May 20, 2017·Pest Management Science·Xue-Fang YangYong-Feng Li
Mar 27, 2018·Pest Management Science·Martin Vila-AiubPedro E Gundel
Jul 30, 2016·Evolution; International Journal of Organic Evolution·Megan L Van EttenRegina S Baucom

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