Potential of endophytic Bacillus toyonensis BAC3151 for phytopathogen control and growth promotion in common bean

Abstract

Bean ( Phaseolus vulgaris L.) crops in Brazil are affected by several fungal diseases such as anthracnose ( Colletotrichum lindemuthianum ), Fusarium wilt ( Fusarium oxysporum f. sp. phaseoli ), and white mold ( Sclerotinia sclerotiorum ). Disease management through biological control is sustainable and environmentally friendly. The purpose of the study was to investigate the potential of endophytic Bacillus toyonensis BAC3151, applied via seed treatment, to control phytopathogens C . lindemuthianum , F. oxysporum f. sp. phaseoli , and S. sclerotiorum , and promote common bean growth. Bacillus toyonensis BAC3151 reduced 95.2%, 24.2%, and 8.2% of the mycelial growth of S. sclerotiorum , C. lindemuthianum , and F. oxysporum f. sp. phaseoli , respectively. Additionally, the disease severity of white mold was reduced by 87.5% in the plants. Bacillus toyonensis BAC3151 showed growth-promoting characteristics, including nitrogen fixation and production of volatile organic compounds, siderophores, indole acetic acid, chitinase, protease, carboxymethyl cellulase, and amylase, as well as significantly increased root length by 31.5% and root dry mass by 33.6%. These findings indicate that B. toyonensis BAC3151 may be used as a biocontrol agent and growth promoter for common bean.

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