Isolation and in vitro screening of plant growth-promoting rhizobacteria from Solanum lycocarpum St. Hil., an endemic plant of the Brazilian tropical savannah

Solanum lycocarpum St. Hil. is an endemic plant of the Brazilian tropical savannah (cerrado) that capable growing on acidic and nutrient-poor land, ability which attracts attention to its rhizospheric microbiota, including growth-promoting rhizobacteria (PGPR). In this work, 131 bacterial strains were isolated from rhizosphere samples S. tested in vitro for direct mechanisms growth promotion (biological nitrogen fixation, phosphate solubilization indolic compounds production) enzyme activities. The 26 most promising isolates selected previous tests used continue screening. Ten these showed antifungal activity against fourteen phytopathogenic fungi twelve antimicrobial at least one three clinical pathogens evaluated. Seven identified random as belonging genera Bacillus, Burkholderia and Microbacterium, are PGPR have potential participate more in-depth research aimed development bio-inputs, especially the Bacillus strains.   Key words: Biological control, biotechnological potential, cerrado, (PGPR), fungi, Rhizosphere,