Bacillus spp. Mediated Growth Enhancement and Antioxidative Defence Activation in Peppermint (Mentha piperita L.).
Singh V, Chandra S, Kishor R, Maurya N, Luqman S
Soil Health
If you grow peppermint or any mint in your garden, inoculating the soil with a Bacillus subtilis-based biostimulant could give you lusher plants and more potent leaves—no synthetic fertilizer required.
Researchers tested five strains of naturally occurring soil bacteria on peppermint plants to see which helped them grow best. One strain, Bacillus subtilis, stood out dramatically—plants treated with it produced significantly more chlorophyll (the green pigment that powers photosynthesis) and ramped up their internal antioxidant defenses, which protect the plant during stress like heat or drought. This suggests that simply adding the right bacteria to the soil could be a natural, low-cost way to grow healthier, more productive mint.
Key Findings
Bacillus subtilis increased peppermint chlorophyll content by 64.71% over untreated controls
B. subtilis treatment raised the stress-protective compound proline by 43.17% and the antioxidant enzyme catalase by 56.33%
All five Bacillus strains tested produced plant-growth-promoting compounds including indole acetic acid, siderophores, and ammonia, but B. subtilis showed the broadest and strongest overall effect
chevron_right Technical Summary
Soil bacteria naturally found near peppermint roots—especially Bacillus subtilis—can significantly boost the plant's growth, stress defenses, and essential oil production without synthetic fertilizers.
Abstract Preview
Peppermint (Mentha piperita L.) is a valuable medicinal and aromatic herb cultivated globally for its essential oil, prized for its therapeutic and flavouring properties. The productivity and essen...
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Peppermint is a hybrid species of mint, a cross between watermint and spearmint. Indigenous to Europe and the Middle East, the plant is now widely spread and cultivated in many regions of the world. It is occasionally found in the wild with its parent species.