Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/19968
Tipo: Artigo
Título: From tolerance to resistance: mechanisms governing the differential response to glyphosate in Chloris barbata
Autor(es): Bracamonte, Enzo
Silveira, Hellen Martins da
Cruz, Ricardo Alcántara‐de la
Domínguez‐Valenzuela, José Alfredo
Cruz‐Hipolito, Hugo Enrique
Prado, Rafael De
Abstract: Susceptibility and the mechanism (s) governing tolerance/resistance to glyphosate were characterized in two putative-glyphosate-resistant Chloris barbata populations (R1 and R2), collected in Persian lime orchards from Colima State, Mexico, comparing them with one non-treated population (referred to as S). Glyphosate doses required to reduce fresh weight or cause mortality by 50% were 4.2–6.4 times higher in resistant populations than in the S population. The S population accumulated 4.3 and 5.2 times more shikimate than the R2 and R1 popu- lations, respectively. There were no differences in 14 C-glyphosate uptake between R and S populations, but the R plants translo- cated at least 12% less herbicide to the rest of plant and roots 96 h after treatment. Insignificant amounts of glyphosate were metabolized to aminomethyl phosphonate and glyoxylate in both R and S plants. The 5-enolpyruvylshikimate-3-phosphate syn- thase gene of the R populations contained the Pro106-Ser mutation, giving them a resistance 12 (R2) and 14.7 (R1) times greater at target-site level compared with the S population. The Pro106-Ser mutation governs the resistance to glyphosate of the R1 and R2 C barbata populations, but the impaired translocation could contribute to the resistance. These results confirm the first case of glyphosate resistance evolved in this species.
Palavras-chave: 5-enolpyruvylshikimate-3-phosphate synthase
Herbicide resistance
Impaired translocation
Pro106-Ser mutation
Purpletop chloris
Editor: Pest Management Science
Tipo de Acesso: Society of Chemical Industry
URI: https://doi.org/10.1002/ps.4874
http://www.locus.ufv.br/handle/123456789/19968
Data do documento: 31-Jan-2018
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