Bacillus velezensis strains are utilized in various agricultural applications as biopesticides, plant growth promoters, and probiotics. Despite their efficacy, the underlying mechanisms driving their bioactivity and adaptability remain unclear. This study aimed to characterize the genetic, epigenetic, and phenotypic diversity of four B. velezensis strains with distinct origins and phenotypes. The strains UCMB5044, UCMB5113, and At1 exhibit endophytic or plant-associated characteristics, while UCMB5007 is a probiotic strain. Genomic sequencing, epigenetic analysis, and gene expression profiling were conducted to elucidate the adaptive strategies of these strains.
B. velezensis strains are known for their rich biosynthetic arsenal comprising various bioactive metabolites such as antibiotics, enzymes, and plant immune response triggers. The strains in this study exhibited differences in gene expression patterns and responses to root exudates, suggesting adaptations to their respective ecological niches. Genome sequencing and epigenetic analysis revealed potential regulatory mechanisms governing the strains’ adaptability and bioactivity. The strains UCMB5113 and At1 share high genetic similarity but display distinct phenotypic traits, emphasizing the role of epigenetic modifications in shaping their behavior.
In vitro assays demonstrated the strains’ antagonistic activity against phytopathogens and entero-pathogens, highlighting their potential as biocontrol agents. Biocontrol assays on tomato seedlings showed promising results in protecting against Ralstonia solanacearum, a pathogen causing bacterial wilt. The strains also exhibited the production of secondary metabolites such as lipopeptides, siderophores, and polyketides, which contribute to their bioactivity. Furthermore, epigenetic analyses revealed modifications associated with gene regulation and adaptive evolution in response to environmental stimuli.
Overall, this study provides valuable insights into the genetic, epigenetic, and phenotypic diversity of B. velezensis strains, shedding light on their potential applications in agriculture. The comprehensive characterization of these strains lays the foundation for future research on harnessing their biocontrol and plant growth-promoting properties. Understanding the intricate mechanisms underlying the adaptability and bioactivity of B. velezensis strains is crucial for enhancing their efficacy as sustainable agricultural solutions.
Tags: lyophilization, sterilization, downstream, chromatography, upstream, centrifugation, regulatory, probiotics, validation, mass spectrometry
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