Microplastics plus antibiotics team up to stress peanut roots
Li X, Chen Y, Wang J, Shu Y, Lv G
Soil Health
If you grow peanuts, beans, or anything in soil that gets plastic mulch residue and manure-borne antibiotics, this study shows those two contaminants together do more damage to root health and plant growth than either one alone.
Scientists grew peanut plants in soil mixed with tiny plastic bits and a leftover antibiotic called oxytetracycline, mimicking the pollution buildup happening in real farm fields. The combination stunted the plants, weakened their antioxidant defenses, and reshuffled the community of bacteria living around their roots, tipping the balance toward less beneficial microbes. The plants also changed their chemical output, ramping up certain protective compounds as a stress response, showing that root-zone microbes and plant chemistry are tightly linked when pollution hits.
Key Findings
High-concentration co-exposure to microplastics (PS or PLA at 2% w/w) and oxytetracycline (10 mg/kg) significantly suppressed peanut shoot biomass, with oxytetracycline the main driver of reduced leaf catalase activity (p < 0.01)
Co-exposure reshaped the rhizosphere microbiome (R2 = 0.939, p = 0.001), enriching Pseudomonadota bacteria while suppressing Actinobacteriota, and altered levels of defensive metabolites like taxifolin, daidzin, and ponasterone A
Combining polylactic acid microplastics with oxytetracycline caused the most severe metabolic disruption, producing 374 differential metabolites versus PLA alone, with Nocardioides bacteria and taxifolin identified as key hub connectors between microbes and plant health
chevron_right Technical Summary
Peanut plants exposed to both microplastics and a common antibiotic showed stunted growth and disrupted defense chemistry, and the soil bacteria living around their roots shifted dramatically in response, offering a warning about how these two pollutants combine in farm soils.
Abstract Preview
Original paper
Phytotoxic effects and rhizosphere microecological responses of peanut to oxytetracycline and microplastic co-exposure.
Microplastics (MPs) and antibiotics represent escalating emerging contaminants in global agricultural soils, posing substantial threats to crop health and ecosystem functionality worldwide. However...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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