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Target-site EPSPS Pro-106 mutations: sufficient to endow glyphosate resistance in polyploid Echinochloa colona?

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Han, H., Yu, Q., Widderick, M. J. and Powles, S. B. (2016) Target-site EPSPS Pro-106 mutations: sufficient to endow glyphosate resistance in polyploid Echinochloa colona? Pest Management Science, 72 (2). pp. 264-271. ISSN 1526-498X

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Article Link: https://doi.org/10.1002/ps.4038

Publisher URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/ps.4038


Abstract BACKGROUND This study confirms and characterises glyphosate resistance in two polyploid Echinochloa colona populations from north-eastern Australia. RESULTS Glyphosate dose response revealed that the two resistant populations were marginally (up to twofold) resistant to glyphosate. Resistant plants did not differ in non-target-site foliar uptake and translocation of 14C-glyphosate, but contained the known target-site 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) mutation Pro-106-Thr and/or Pro-106-Leu. Although plants carrying either a single or two EPSPS mutations were glyphosate resistant relative to the susceptible population, they were still controlled at the field rate of glyphosate (450 g a.e. ha−1) when treated under warm conditions (25/20 °C). However, when treated in hot conditions (35/30 °C), most mutant resistant plants (68%) can survive the field rate, and an increase (2.5-fold) in glyphosate LD50 was found for both the R and S populations. CONCLUSIONS This study shows that one or two EPSPS Pro-106 mutations are insufficient to confer field-rate glyphosate resistance in polyploidy E. colona at mild temperatures. However, control of these mutant plants at the glyphosate field rate is poor at high temperatures, probably owing to reduced glyphosate efficacy. Therefore, glyphosate should be applied during relatively mild (warm) temperature periods in the summer growing season to improve E. colona control. © 2015 Society of Chemical Industry

Item Type:Article
Business groups:Crop and Food Science
Keywords:Echinochloa colona EPSPS glyphosate efficacy glyphosate resistance target-site mutation temperature effect
Subjects:Agriculture > Agriculture (General) > Agricultural meteorology. Crops and climate
Agriculture > Agriculture (General) > Methods and systems of culture. Cropping systems
Plant pests and diseases
Plant pests and diseases > Plant pathology
Live Archive:14 Jun 2021 05:34
Last Modified:03 Sep 2021 16:46

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