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Background and aims The endophytic bacterium Gluconacetobacter diazotrophicus produces exopolysaccharides (EPS) that are required for biofilm formation and colonization of rice seedlings. Here we investigated whether EPS produced by the G. diazotrophicus strain Pal5 protects the bacteria against free radicals. Methods EPS-mediated protection of Pal5 cells against oxidative damage was evaluated by...