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In semiarid regions is important to use native strains best adapted to these environments to optimize plant-PGPR interaction. We aimed to isolate and characterize PGPR from roots and rhizosphere of a tomato crop, as well as studying the effect of its inoculation on tomato seedlings growth. We selected four strains considering their effectiveness of fixing nitrogen, solubilizing phosphate, producing siderophores and indole acetic acid. They belong to the genera  Enterobacter ,  Pseudomonas ,  Cellulosimicrobium,  and  Ochrobactrum . In addition, we also analyzed the ability to solubilize Ca 3 (PO 4 ) 2 , FePO 4  and AlPO 4  and the presence of one of the genes encoding the cofactor PQQ in their genome.  Enterobacter  64S1 and  Pseudomonas  42P4 showed the highest phosphorus solubilizing activity and presence of  pqq E gene. Furthermore, in a tomato-based bioassay in speed-bed demonstrated that a sole inoculation at seedling stage with the strains increased dry weight of roots (49–88%) and shoots (39–55%), stem height (8–13%) and diameter (5–8%) and leaf area (22–31%) and were equal or even higher than fertilization treatment. Leaf nitrogen and chlorophyll levels were also increased (50–80% and 26–33%) compared to control. These results suggest that  Enterobacter  64S1 and  Pseudomonas  42P4 can be used as bio-inoculant in order to realize a nutrient integrated management.

Native bacteria isolated from roots and rhizosphere of Solanum lycopersicum L. increase tomato seedling growth under a reduced fertilization regime