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Symbiotic nitrogen fixation is the most environmentally friendly method for the accumulation of biologically bound nitrogen. Nitrogen fixation is carried out by bacteria, including from the class of ?-proteobacteria. Global climate changes lead to an increase of agricultural areas subjected to salinity. Current knowledge about the effect of high-salt stress on nitrogen-fixing symbiotic ?-proteobacteria has the appearance of a puzzle. The genetic mechanisms determining salt tolerance have been studied in the most d...