What does the published scientific research say about Bacillus haynesii?

Eight PubMed-indexed studies cite Bacillus haynesii in plant-input contexts, spanning biocontrol, plant growth promotion, and abiotic-stress tolerance. Isolates appear across diverse systems — pulse rhizosphere soils in India, coastal halophilic communities in Gujarat, endophytic communities in pea and chickpea, and rice and wheat rhizospheres — suggesting broad ecological range, though what the research shows for each context varies considerably by study.

Antifungal and biocontrol properties are among the most-reported findings. A marine-derived B. haynesii chitinase (BhChi, ~35 kDa) was purified and characterized, showing activity against Fusarium oxysporum and Penicillium chrysogenum; peer-reviewed literature describes it as the first exochitinase reported from this species. Separately, pomegranate field trials cited in the literature found a B. haynesii endophyte reduced bacterial blight disease index by 47–68% across two seasons, outperforming a chemical immune modulator in the same trials.

Other published studies report B. haynesii isolates producing IAA, phosphate-solubilizing enzymes, and siderophores. A wheat trial cited in the literature found isolate PSB13 (B. haynesii) significantly increased shoot phosphorus content under drought and low-P conditions. A rice pot study reported the highest biomass accumulation in the B. haynesii 2P2 treatment under high-salinity conditions. One poultry-farm study also identified B. haynesii among strains with aflatoxin degradation activity, noted as a first report for the species. None of these findings constitute regulatory approval or label-claim authorization.