Characterization of the Amaranthus palmeri physiological response to glyphosate in susceptible and resistant populations
2016
Fernández Escalada, Manuel | Gil Monreal, Miriam | Zabalza Aznárez, Ana | Royuela Hernando, Mercedes | Ciencias del Medio Natural | Natura Ingurunearen Zientziak | Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa
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显示更多 [+] 显示较少 [-]The herbicide glyphosate inhibits the plant enzyme 5-enolpyruvylshikimate3-phosphate synthase (EPSPS) in the aromatic amino acid (AAA) biosynthetic pathway. The physiologies of an Amaranthus palmeri population exhibiting resistance to glyphosate by EPSPS gene amplification (NC-R) and a susceptible population (NC-S) were compared. The EPSPS copy number of NC-R plants was 47.5-fold the copy number of NC-S plants. Although the amounts of EPSPS protein and activity were higher in NC-R plants than in NC-S plants, the AAA concentrations were similar. The increases in total free amino acid and in AAA contents induced by glyphosate were more evident in NC-S plants. In both populations, the EPSPS protein increased after glyphosate exposure, suggesting regulation of gene expression. EPSPS activity seems tightly controlled in vivo. Carbohydrate accumulation and a slight induction of ethanol fermentation were detected in both populations.
显示更多 [+] 显示较少 [-]This work was financially supported by a grant from the Ministerio Español de Economıa y Competitividad (AGL- 2013-40567R). M.F.-E. and M.G.-M. received funding from fellowships through the Universidad Publica de Navarra.
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