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.

Karen Liebrenz, Romina Frare, Cristina Gómez, Cecilia Pascuan, Silvina Brambilla, Diego Soldini, Vanina Maguire, Alejandro Carrio, Oscar Ruiz, Wayne McCormick, Gabriela Soto, Nicolás Ayub

Journal: Research in microbiology 2022;173(6-7):103952

PMID: 35436545

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Abstract

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.

Address: Instituto de Agrobiotecnología y Biología Molecular (IABIMO), Buenos Aires, Argentina; Instituto de Genética (IGEAF), Buenos Aires, Argentina.; Estación Experimental Agropecuaria Marcos Juárez, INTA, Córdoba, Argentina.; Instituto Tecnológico Chascomús (INTECH-CONICET), Buenos Aires, Argentina.; Ottawa Research and Development Centre (AAFC), Ottawa, ON, Canada.; Instituto de Agrobiotecnología y Biología Molecular (IABIMO), Buenos Aires, Argentina; Instituto de Genética (IGEAF), Buenos Aires, Argentina. Electronic address: [email protected].

DOI: 10.1016/j.resmic.2022.103952

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MeSH Terms: Alanine, Bradyrhizobium, Glycine, Mutation, Nitrogen Fixation, Nitrogenase, Rhizobium, Serine, Symbiosis, Glyphosate