Temperature-dependent biofilm and sublancin production arrest soil arsenic and antibiotic resistance gene mobility.
Majumdar A, Kotta-Loizou I, Buck M, Roychowdhury T
Soil Health
Arsenic quietly accumulates in garden beds near old orchards, painted fences, or busy roads, and this warm-season bacterial amendment could lock it in the soil before your carrots and beets take it up — while also slowing the invisible spread of antibiotic resistance happening just below your feet.
Scientists discovered that a common soil bacterium can be added to garden or farm soil to do two powerful things at once: it traps arsenic — a toxic heavy metal that can sneak into root vegetables — and it stops harmful traits that make bacteria resistant to antibiotics from spreading through the soil. The bacterium forms a sticky mat around plant roots that physically holds arsenic in place, and it also releases a natural compound that kills dangerous bacteria without harming the beneficial ones. Remarkably, both effects get stronger as soil temperatures warm, suggesting this treatment could become more useful, not less, as climate change progresses.
Key Findings
Arsenic sequestration increased by 74% at 35°C compared to lower temperatures, with up to 14-fold more arsenic locked to plant roots in greenhouse trials.
The antimicrobial compound sublancin peaked in production at 30°C (129.72 mg/L), suppressing all 12 tested pathogenic bacterial species by 74–86% while leaving beneficial Gram-negative soil bacteria unharmed.
Adding the bacterial amendment to soil reduced the frequency of antibiotic-resistance gene transfer by 74.7% across all tested temperature conditions.
chevron_right Technical Summary
A soil bacterium (Bacillus subtilis) naturally forms a sticky biofilm and produces an antimicrobial compound that trap arsenic in soil while simultaneously blocking the spread of antibiotic-resistance genes between bacteria — and both effects strengthen as temperatures rise, making this a potentially climate-adaptive soil treatment for agriculture.
Abstract Preview
Climate change-induced warming and arsenic soil contamination synergistically threaten agricultural sustainability by restructuring microbial communities and accelerating antimicrobial resistance d...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Was this useful?
Urban Tree Canopy Reduces Heat-Related Mortality by 39% in European Cities
Trees in your local park or street aren't just pretty — they are literally keeping people alive during heatwaves, and planting even a modest number of the ri...