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|Title:||Temperature influences the level of glyphosate resistance in barnyardgrass (Echinochloa colona)|
|Citation:||Pest Management Science, 2016; 72(5):1031-1039|
|Thai Hoan Nguyen, Jenna M Malone, Peter Boutsalis, Neil Shirley and Christopher Preston|
|Abstract:||BACKGROUND: Echinochloa colona is an important summer-growing weed species in cropping regions of northern Australia that has evolved resistance to glyphosate due to intensive use of this herbicide in summer fallow. RESULTS: Pot trials conducted at 20°C and 30°C on six E. colona populations showed a significant increase in the level of glyphosate resistance in resistant populations at 30°C compared with 20°C. However, there was no influence of growth temperature on glyphosate susceptibility of the sensitive population. Sequencing of the target-site gene (EPSPS) of the six populations identified a mutation at position 106 leading to a change from proline to serine in the most resistant population A533.1 only. EPSPS gene amplification was not detected in any resistant populations examined. Examining (14) C-glyphosate uptake on two resistant and one susceptible population showed a 2-fold increase at 20°C; however, few differences in glyphosate translocation occurred from the treated leaf to other plant parts between populations or temperatures. CONCLUSION: There is reduced efficacy of glyphosate at high temperatures on resistant E. colona populations, making these populations harder to control in summer.|
|Keywords:||EPSPS; Echinochloa colona; absorption; barnyardgrass; glyphosate resistance; resistance mechanism; shikimate; translocation|
|Rights:||© 2015 Society of Chemical Industry|
|Appears in Collections:||Agriculture, Food and Wine publications|
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