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Plant growth promoter microorganisms (PGPM) associate with plants with benefits to plant productivity and protection. Among these microorganisms, yeasts have shown potential results. The aims here were to prospect yeasts with PGPM traits from organic maize soil and to evaluate molasses as substrate to produce indole-3-acetic acid (IAA). The isolates were selected considering IAA production, phosphate solubilization and phytopathogen control, following the phenotypic characterization. Seven strains were selected, identified by sequencing of D1/D2 domain of rDNA 26S gene and evaluated to produce IAA in molasses and potato dextrose broth (PD) with and without tryptophan. Non-filtered medium (NFM) and cell-free filtrate (CFF) of yeasts were used in an in vivo assay of maize seed germination and initial development. Twenty-eight yeasts were isolated, and 82% tested positive for the PGPM traits. The …