What benefits of Bacillus siamensis have been cited in the scientific literature?
Bacillus siamensis — also recorded in the literature as Bacillus vanillea — has 21 benefits cited across peer-reviewed research, spanning plant growth promotion and biocontrol. These are research-grounded potential claims, not approved registrations or label endorsements.
Studies report a broad plant-growth-promoting profile for this bacterium: IAA production, siderophore and ACC deaminase synthesis, nitrogen fixation, and phosphate solubilization up to 385.11 mg/L. Growers or formulators searching for Bacillus siamensis biostimulant activity or phosphate-solubilizing bacteria will find this strain cited across multiple crop contexts in the peer-reviewed literature.
On the biocontrol side, the literature cites suppression of Botrytis cinerea gray mold in tomato, Fusarium oxysporum f. sp. cucumerinum cucumber wilt (73.2% control efficacy at 10⁸ cfu/mL), and Fusarium graminearum via iturin-family lipopeptide biosurfactants. Reported volatile organic compound inhibition across plant-pathogenic fungi ranges from 60.11% to 100% in vitro, with additional in-vitro activity against Macrophomina phaseolina and Sclerotinia sclerotiorum.
Field trials cited in the literature show yield gains and improved phosphorus acquisition efficiency in maize and soybean, with greater yield stability across environments. Crop-level studies also report growth responses in chickpea, black pepper, lettuce — including cadmium stress tolerance linked to antioxidant activity — and cucumber.
1AAPFCO-accepted claims
Listing details- Bacillus siamensis PB12 may increase growth and fruit yield.
Accepted wording, shown verbatim · source: AAPFCO Plant Biostimulant list
2Potential claims from the literature
Reported to solubilize phosphate (385.11 mg/L) as a plant growth-promoting trait
Reported to produce indole-3-acetic acid (IAA) as a plant growth-promoting trait
Reported to produce siderophores as a plant growth-promoting trait
Reported to promote lettuce seedling growth and help plants tolerate cadmium (Cd) stress, with increased antioxidant activities for scavenging reactive oxygen species (ROS) induced by Cd stress
Reported to suppress gray mold disease (Botrytis cinerea) in tomato plants, with Bacillus siamensis CEBZ11 identified as the most effective strain in protecting tomato plants from gray mold
Reported to improve tomato plant vigor indexes compared to control
Reported to suppress multiple plant pathogenic fungi through production of volatile organic compounds (VOCs), with inhibition rates ranging from 60.11% to 100%
Reported to suppress Fusarium oxysporum f. sp. cucumerinum (FOC) causing cucumber wilt, with a control efficacy of 73.2% at 10⁸ cfu/mL
Reported to significantly improve cucumber plant growth parameters including fresh weight, dry weight, plant height, and root height upon inoculation
Reported to increase the activity of defensive enzymes (peroxidase, polyphenol oxidase, and phenylalanine ammonia-lyase) in diseased cucumber roots, thereby raising plant resistance
Reported to produce lipopeptide biosurfactants (iturin family) with significant antagonistic activity against Fusarium graminearum, completely inhibiting conidial germination at 100 µg/mL
Reported to exhibit nitrogen fixation as a plant growth-promoting trait
Reported to solubilize phosphate as a plant growth-promoting trait
Reported to exhibit broad-spectrum antifungal activity against multiple plant pathogenic fungi, with cell-free supernatant achieving 60–80% inhibition of radial growth
Reported to enhance shoot and root length and chlorophyll content of chickpea plants in pot experiments
Reported to produce ACC deaminase as a plant growth-promoting trait
Reported to antagonize Fusarium solani, the causal agent of slow decline disease in black pepper, and to stimulate black pepper plant growth and root development
Reported to significantly increase root biomass in greenhouse experiments
Reported to significantly increase yield and phosphorus acquisition efficiency in maize and soybean field trials compared to non-inoculated control
Reported to exhibit biocontrol activity against Macrophomina phaseolina and Sclerotinia sclerotiorum in vitro
Reported to demonstrate greater yield stability across different environmental conditions in field trials
See the full picture on Bacillus siamensis
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