Plant growth promoting (PGP) activities of rhizobacterial strains recovered from mustard rhizosphere. Vertical bars represent mean of three replicates ± standard errors. Set 1, Set 2, Set 3 and Set 4 represent the PGP traits of the rhizobacterial strain PS1, PS2, PS9 and PS19, respectively. Salicylic acid; DHBA = 2,3-dihydroxy benzoic acid; IAA = indole acetic acid; EPS = exo-polysaccharides.