Associative diazotrophic bacteria isolated from different biomes as potential plant growth promoters of common bean
DOI:
https://doi.org/10.36560/19320262190Palavras-chave:
Biological nitrogen fixation (BNF), Azospirillum, Plant growth-promoting bacteria (PGPB), Phaseolus vulgaris, Rhizosphere, NodulationResumo
Associative diazotrophic bacteria can promote plant growth; however, their efficiency depends on the compatibility among host, microorganism, and environment. This study evaluated bacterial strains with high in vitro potential for nitrogen (N) fixation and indole-3-acetic acid (IAA) synthesis, isolated from the Atlantic Forest (Sp7), Cerrado (Ab-V5), and Amazon (MS32 and MS52) biomes, regarding their ability to promote growth and nodulation of common bean (Phaseolus vulgaris L.). The experiment was conducted in a greenhouse, in a completely randomized design with eight replications. Emergence, chlorophyll index, morphological parameters, nodulation, and rhizospheric bacterial density were evaluated. Although the selected strains showed high in vitro potential for N fixation and IAA production, they did not promote common bean growth. These results indicate the need to investigate other growth-promotion mechanisms that may be more promising for selecting efficient bacteria for common bean growth promotion.
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Accepted 2026-03-10
Published 2026-04-13
