A groundbreaking study published in the Journal of Hazardous Materials has unveiled a “nature-based weapon” that could revolutionize agriculture in the Indo-Gangetic Plain. Researchers from Imperial College London and Jadavpur University have discovered that Bacillus subtilis, a common and harmless soil bacterium, can simultaneously neutralize arsenic uptake in crops and eliminate drug-resistant “superbugs” in the ground.
This discovery offers a potential lifeline for millions of farmers across Bengal, Bihar, and Uttar Pradesh, where the dual threats of toxic groundwater and antimicrobial resistance (AMR) have created a public health emergency.
How Bacillus Subtilis Works
The study, led by Arnab Majumdar and Tarit Roychowdhury, reveals that Bacillus subtilis acts as a biological shield within the crop root zone through two distinct mechanisms.
Arsenic Trap
The bacterium produces a sticky, natural biofilm—a biological matrix that effectively traps arsenic in the soil. This prevents the toxic heavy metal from being absorbed by rice roots, keeping it out of the grain and the food supply.
Superbug Destroyer
It secretes a natural antibiotic-like compound called sublancin. This compound selectively targets and destroys high-risk, drug-resistant pathogens in the soil without harming beneficial microbes or the crop itself.
Enhanced Efficiency in Heat
In a remarkable twist, the bacterium’s efficiency increases as temperatures rise. During the intense summer heatwaves typical of the Indo-Gangetic Plain (30°C-35°C), the bacterium becomes hyperactive, trapping 74% more arsenic and synthesizing higher volumes of sublancin.
“What excites us most is that this is not a chemical intervention,” says Arnab Majumdar.
