Biochemical characteristics of potential beneficial microorganisms
DOI:
https://doi.org/10.1590/1983-21252026v3912903rcKeywords:
Rhizobacteria. Phosphorus solubilization. Indole-3-acetic acid (IAA) production. Nitrogen fixation. Biofilm production.Abstract
The use of plant growth-promoting bacteria can significantly increase crop grain yield while reducing synthetic inputs and production costs, representing a sustainable agricultural practice. This study aimed to biochemically characterize bacterial strains with potential plant growth-promoting activity. For each biochemical characteristic evaluated (nitrogen fixation, nutrient solubilization, and production of hydrogen cyanide, indole-3-acetic acid (IAA), and biofilm), an experiment was conducted with twenty-nine treatments, namely M01 (Leclercia adecarboxylata), M02 (Priestia megaterium), M03 (Pseudomonas sp.1), M04 (Pseudomonas sp.2), M05 (Enterobacter hormaechei), M06 (Bacillus toyonensis), M07 (Serratia nematodiphila), M08 to M28 (combination of microorganisms), and M29 (control - without microorganisms). Bacillus toyonensis (M06), Serratia nematodiphila (M07), Enterobacter hormaechei (M05), and Priestia megaterium (M02) exhibited multiple plant growth-promoting traits, including nutrient solubilization, nitrogen fixation, biofilm formation, and IAA production. Among the evaluated treatments, M05, M11, M16, M20, and M24 exhibited the highest IAA production (42.95–49.08 µg/mL). Treatments M12, M17, and M28 showed strong multi-nutrient solubilization capacity. Overall, the results indicate that specific bacterial combinations can enhance biochemical functions and may be strategically selected to improve plant growth-promoting activity.
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