Antibiotic Metabolites Are an Overlooked Driver of Resistance Dissemination in Plant Systems.
Li Y, Sun J, Dai Z, Jin LN, Chen Z
Soil Health
Lettuce you grow with recycled water or irrigate near agricultural land may silently carry antibiotic breakdown products that help bacteria trade resistance genes — long after the original antibiotic has faded.
Scientists watered lettuce with tiny amounts of the antibiotic tetracycline and its breakdown products to see what happened inside the plant. Surprisingly, the breakdown products — not the original antibiotic — stuck around longer and spread further through the leaves. Even at the low levels commonly found in farm irrigation water, these remnants helped bacteria share the genetic tricks that make antibiotics stop working.
Key Findings
Tetracycline accumulated mainly in lettuce roots and decreased as it moved upward, but its metabolite anhydrotetracycline (ATC) persisted longer and became the dominant residue inside the plant through in-plant chemical conversion.
At environmentally realistic concentrations as low as ≤0.1 mg/L — levels routinely detected in agricultural runoff — antibiotic metabolites still promoted the spread of antibiotic resistance genes.
ATC, not the parent antibiotic tetracycline, was the primary driver of resistance gene dissemination, meaning current risk assessments that focus only on the original antibiotic are likely underestimating the true hazard.
chevron_right Technical Summary
Antibiotic breakdown products in agricultural water persist inside lettuce longer than the original antibiotics and, even at trace concentrations found in farm runoff, actively spread antibiotic resistance genes through the plant — a risk that food-safety guidelines have largely ignored.
Abstract Preview
Antibiotic pollution in agroecosystems is widely recognized, yet the risks posed by their metabolites remain insufficiently addressed. Using lettuce as a model, we investigated how tetracycline (TC...
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