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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 |
Aparece nas coleções: | Fitotecnia - Artigos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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artigo.pdf Until 2100-12-31 | Texto completo | 590,68 kB | Adobe PDF | Visualizar/Abrir ACESSO RESTRITO |
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