Shaping antibiotic resistance gene fate in soil-plant systems: Dual roles of biochar physicochemical traits mediated by pyrolysis conditions.
Zhang G, Zheng Q, Hua L, Dong Q, Guo H
Soil Health
The bag of biochar you work into your vegetable bed may be quietly ferrying antibiotic-resistant microbial genes from the soil into the leaves and stems of the crops you eat — and how that biochar was made changes which resistance genes end up on your plate.
Biochar is a charcoal-like material many gardeners add to soil to improve its structure and fertility. Researchers grew turnips in biochar-amended soil and found that the plants absorbed significantly more antibiotic-resistance genes — the genetic blueprints bacteria use to survive antibiotics — than plants in unamended soil. The surprising twist is that how the biochar was made (burned in open air versus heated in a sealed chamber without oxygen) changed which specific resistance genes ended up inside the plant, because each biochar type shaped the community of soil microbes differently.
Key Findings
Biochar application increased antibiotic resistance gene abundance in plant stems and leaves by 20–72% across all three biochar types tested.
Open-flame biochar (oxygen-rich surface chemistry) stimulated microbial activity and promoted multidrug resistance genes, while 500°C kiln-made biochars selectively elevated aminoglycoside and tetracycline resistance genes while eliminating vancomycin and sulfonamide resistance types.
Structural equation modeling showed biochar's direct effect on resistance genes was actually negative (adsorption), but this was overwhelmed by indirect positive effects through soil bacterial community restructuring — making the soil microbiome the dominant driver of resistance gene fate.
chevron_right Technical Summary
Adding biochar to soil — a common gardening practice — can increase antibiotic resistance genes in vegetable plants by up to 72%, and the type of biochar matters: open-flame charcoal behaves very differently from kiln-made charcoal, selecting for different resistance profiles in plant tissue.
Abstract Preview
Antibiotic resistance genes (ARGs), emerging contaminants spreading via horizontal gene transfer, threaten ecosystems and human health. Biochar (BC) is a widely used agricultural soil amendment, ye...
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