| Autor: |
Liu C; Syngenta, Herbicide Bioscience, Jealott's Hill International Research Centre, Bracknell, RG42 6EY, UK. chun.liu@syngenta.com., Jackson LV; Syngenta, Herbicide Bioscience, Jealott's Hill International Research Centre, Bracknell, RG42 6EY, UK., Hutchings SJ; Syngenta, Herbicide Bioscience, Jealott's Hill International Research Centre, Bracknell, RG42 6EY, UK., Tuesca D; Cátedra de Malezas, Facultad de Ciencias Agrarias, Universidad Nacional de Rosario, S2125ZAA, Zavalla, Argentina., Moreno R; Syngenta Argentina, Oficina Central, Av. Libertador 1855, Vicente López, B1638BGE, Buenos Aires, Argentina., Mcindoe E; Syngenta, Herbicide Bioscience, Jealott's Hill International Research Centre, Bracknell, RG42 6EY, UK., Kaundun SS; Syngenta, Herbicide Bioscience, Jealott's Hill International Research Centre, Bracknell, RG42 6EY, UK. |
| Abstrakt: |
Agricultural weeds can adapt rapidly to human activities as exemplified by the evolution of resistance to herbicides. Despite its multi-faceted nature, herbicide resistance has rarely been researched in a holistic manner. A novel approach combining timely resistance confirmation, investigation of resistance mechanisms, alternative control solutions and population modelling was adopted for the sustainable management of the Amaranthus palmeri weed in soybean production systems in Argentina. Here, we show that resistance to glyphosate in the studied population from Cordoba province was mainly due to a P106S target-site mutation in the 5-enolpyruvylshikimate 3-phosphate synthase (EPSPS) gene, with minor contributions from EPSPS gene duplication/overexpression. Alternative herbicides, such as fomesafen, effectively controlled the glyphosate-resistant plants. Model simulations revealed the tendency of a solo herbicidal input to primarily select for a single resistance mechanism and suggested that residual herbicides, alongside chemical diversity, were important for the sustainable use of these herbicides. We also discuss the value of an interdisciplinary approach for improved understanding of evolving weeds. |
