The bacterial strains showed direct and indirect PGP activities (Table 3). 18 strains were capable of producing a clear zone on an inorganic phosphate-supplemented medium. However, Aeromonas salmonicida (S11) and Pseudomonas fluorescens (S14) had the greatest facility to display a larger diameter of the halo zone, which was 23.5 ± 0.5 mm. The minimum value 2.7 ± 0.5 mm clear zone was related to the strains Clavibacter michiganensis (L10) and Curtobacterium flaccumfaciens (S4).