info:ar-repo/semantics/artículo
Multiple ways to evade the bacteriostatic action of glyphosate in rhizobia include the mutation of the conserved serine 90 of the nitrogenase subunit NifH to alanine
Fecha
2022-07Autor
Liebrenz, Karen Ivana
Frare, Romina Alejandra
Gomez, Maria Cristina
Pascuan, Cecilia Gabriela
Brambilla, Silvina Maricel
Soldini, Diego Omar
Maguire, Vanina
Carrio, Alejandro Javier
Ruiz, Oscar
McCormick, Wayne
Soto, Gabriela Cynthia
Ayub, Nicolás Daniel
Resumen
The genome resequencing of spontaneous glyphosate-resistant mutants derived from the soybean inoculant E109 allowed identifying genes most likely associated with the uptake (gltL and cya) and metabolism (zigA and betA) of glyphosate, as well as with nitrogen fixation (nifH). Mutations in these genes reduce the lag phase and improve nodulation under glyphosate stress. In addition to providing glyphosate resistance, the amino acid exchange Ser90Ala in NifH increased the citrate synthase activity, growth rate and plant growth-promoting efficiency of E109 in the absence of glyphosate stress, suggesting roles for this site during both the free-living and symbiotic growth stages.