Fungus and earthworms team up to clean herbicide-tainted soil
Chen P, Dong R, Jiang M, Zhao L, Ye H
Phytoremediation
If you've ever worried about herbicide residue lingering in soil after treating weeds, this shows a low-tech combo of common earthworms and a soil fungus can break the chemical down far faster than either one working solo.
Metolachlor is a common weed-killer that can linger in soil and harm the ecosystem. Researchers found that adding earthworms to soil already treated with a helpful fungus sped up the breakdown of this herbicide dramatically, removing almost 94% of it in two weeks compared to just 30% from worms alone or 82% from the fungus alone. The worms also improved soil health by balancing pH, freeing up phosphorus, and encouraging a more diverse, friendlier community of soil microbes.
Key Findings
Combining Penicillium oxalicum MetF1 fungus with Eisenia fetida earthworms removed 93.88% of metolachlor from soil in 14 days, versus 81.75% for fungus alone and 30.10% for earthworms alone.
Earthworms boosted soil microbial diversity, enriched beneficial degrading microbes (Sphingomonas, Flavobacterium, Fusarium), and suppressed the pathogenic fungus Blumeria.
Earthworms showed low bioaccumulation of the herbicide (BAF < 1) and gained net body weight, suggesting no obvious lethal toxicity, though effects of breakdown byproducts still need study.
chevron_right Technical Summary
Scientists paired a soil fungus with earthworms to clean up herbicide-contaminated soil, and the team worked far better together than either did alone, clearing nearly 94% of the pollutant in just two weeks.
Abstract Preview
Original paper
Synergistic bioremediation of metolachlor-contaminated soil by Penicillium oxalicum MetF1 and earthworms: Enhanced degradation, microbial community restructuring, and ring-opening metabolic activation.
The chloroacetamide herbicide metolachlor (MET) is a widespread environmental contaminant posing risks to aquatic and soil ecosystems. Although the fungal strain Penicillium oxalicum MetF1 efficien...
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