Bacillus velezensis (null)

Molecular Classification

Other (Bacterium; Gram-positive, aerobic, endospore-forming, member of family Bacillaceae)

Other Names

Bacillus amyloliquefaciens subsp. plantarum, Bacillus methylotrophicus, Bacillus oryzicola

Disease Roles

Infection (from the perspective of plant pathogen suppression; not itself a human/animal disease role)Other (biocontrol agent in agriculture)

Bacillus velezensis Overview

Bacillus velezensis is an aerobic, Gram-positive, endospore-forming bacterium within the genus Bacillus. It was defined as a distinct species following phylogenomic reclassification, absorbing several previously independent Bacillus species. Strains of B. velezensis are widely recognized for their production of bioactive compounds (including lipopeptides such as surfactin, iturin, fengycin, and polyketides like bacillaene, difficidin, and macrolactin) which confer broad-spectrum antimicrobial activity against bacterial, fungal, and nematode pathogens of plants. This bacterium promotes plant growth both directly (e.g., phytohormone production, nitrogen fixation) and indirectly (disease suppression), and it can trigger plant immune responses (induced systemic resistance). B. velezensis is used chiefly as a biocontrol agent in agriculture, rather than as a human therapeutic target.

Mechanism of Action

Biological Functions

Plant growth promotion

Suppression of microbial pathogens (antagonism)

Production of secondary metabolites (e.g., antibiotics, polyketides, lipopeptides)

Induction of systemic resistance in plants

Disease Associations

Infection (from the perspective of plant pathogen suppression; not itself a human/animal disease role)

Other (biocontrol agent in agriculture)

Safety Considerations

Not a human pathogen under normal circumstances
Generally regarded as safe for plants and environmental use in biocontrol, but as with all biocontrol agents, possible risks should be assessed in each application