What benefits of Bacillus atrophaeus have been cited in the scientific literature?
On growth promotion, the literature reports stimulatory effects on corn (Zea mays L.) and tomato (Solanum lycopersicum) under greenhouse and nitrogen-limited conditions, growth promotion in Arabidopsis via volatile emissions, induction of IAA-related gene expression, and siderophore production — all reported in peer-reviewed research, not approved label claims.
Bacillus atrophaeus biocontrol research is particularly detailed. Studies cite strong inhibitory activity against Botrytis cinerea and multiple phytopathogens, high efficacy against Fusarium oxysporum f. sp. cucumerinum — with fengycin identified as the primary antifungal component — and in vitro inhibition rates of 94.62% against Wilsonomyces carpophilus (shot hole disease in wild apricots). Chitinase, glucanase, and protease production; poly-γ-glutamic acid supporting rhizosphere colonization; induced systemic resistance against Pseudomonas syringae pv. tomato DC3000; and lead, zinc, and copper resistance relevant to heavy metal-contaminated soils are also cited in the literature.
1AAPFCO-accepted claims
Listing details- Nitrogen fixing.
Accepted wording, shown verbatim · source: AAPFCO Plant Biostimulant list
2Potential claims from the literature
Reported to produce siderophores
Reported to promote growth of Zea mays L. (corn) and Solanum lycopersicum (tomato) under greenhouse conditions, including under limited nitrogen conditions
Reported to promote growth of Arabidopsis via volatile chemical emissions
Reported to induce expression of genes related to IAA production in treated Arabidopsis plants
Reported to trigger induced systemic resistance (ISR) against Pseudomonas syringae pv. tomato DC3000 in Arabidopsis
Reported to exhibit strong inhibitory activity against Botrytis cinerea and multiple other phytopathogens
Reported to produce cell-wall-degrading enzymes (chitinase, glucanase, and protease) that degrade fungal cell walls
Reported to form significant biofilm, which may contribute to biocontrol activity
Reported to exhibit high inhibition efficacy against Fusarium oxysporum f. sp. cucumerinum (FOC), with fengycin identified as the primary extracellular antifungal component
Reported to inhibit germination of Fusarium oxysporum f. sp. cucumerinum spores and induce oxidative stress in pathogen cells via fengycin secretion
Reported to produce poly-γ-glutamic acid (γ-PGA) that promotes rhizosphere colonization and enhances biocontrol activity against Cucumber Fusarium wilt
Reported to exhibit significant biocontrol potential against Wilsonomyces carpophilus causing shot hole disease in wild apricots, with fermentation broth achieving in vitro inhibition rates of 94.62% and in vivo inhibition rates of 82.46%
Reported to possess heavy metal resistance (lead, zinc, copper) and plant growth-promoting traits useful for ameliorating heavy metal-contaminated soils
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