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Characterization and genomic insight of surfactin-producing Bacillus velezensis and its biocontrol potential against pathogenic contamination in lettuce hydroponics

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Abstract

Due to food borne pathogen, maintaining the viability of fresh fruits and vegetable is a great concern. Several strategies including microbial and plant-based formulations to reduce their infection and maintain quality of the fresh food are in practice. Currently, Bacillus has gained significant traction as a biocontrol agent for regulating diseases affecting a variety of agricultural and horticultural crops. Food-grade citric acid and plant growth–promoting rhizobacteria (PGPR) were used as antimicrobial agent, MIC results showed that PGPR (14.87 mm) and CA (20.25 mm) exhibited notable antimicrobial activity against E. coli. Lettuce treated with PGPR showed reduction in E. coli contamination, E. coli was detected at 3.30, 3.68 in control, and 2.7 log CFU/g in random root injury lettuce inoculated with PGPR KACC 21110 respectively. Random root injury showed a trend toward increasing E. coli internalization. The strains exhibited resistance to multiple antibiotics, including Imipenem, tetracycline, ampicillin, cefotaxime, cefoxitin, and ceftriaxone. Comprehensive data analysis revealed the presence of ten putative bacteriocin or bacteriocin-like gene clusters. The structure of lipopeptide homologs was characterized by using QTOF-MS/MS. The mass ion peaks attributed to surfactin homologs, surfactin A ion at m/z 1008.66, surfactin B, C at m/z 1022.67 and 1036.69. In addition to surfactin, a polyketide oxydifficidin and lipopeptide NO were extracted and detected from the extract of B. velezensis. Both isolates are key biocontrol agents and have significant potential in combating foodborne pathogens and can be utilized to explore novel antibacterial products for preventing pathogens in fresh produce.

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Change history

  • 20 November 2023

    19573–3 should not have a comma.

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Funding

This research work was carried out with the support of the “Research Program for Agriculture Science and Technology Development (Project No. PJ0155852023)” National Institute of Agricultural Science, Rural Development Administration (RDA), Republic of Korea.

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Husna performed the experimental work and wrote the original draft. Bo-eun Kim supervised the study and designed the project. Myeong-hee Won helped with the experiment and methodology. Myeong-In Jeong, Kwang-Kyo Oh, and Dong-Suk Park facilitated the study by providing valuable suggestions and engaging in discussions. All authors have read the manuscript and approved its final form.

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Correspondence to Bo-Eun Kim.

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Husna, Kim, BE., Won, MH. et al. Characterization and genomic insight of surfactin-producing Bacillus velezensis and its biocontrol potential against pathogenic contamination in lettuce hydroponics. Environ Sci Pollut Res 30, 121487–121500 (2023). https://doi.org/10.1007/s11356-023-30871-4

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  • DOI: https://doi.org/10.1007/s11356-023-30871-4

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