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Polyethylene Microplastics Inhibit Peanut Nodulation via Metabolic and Transcriptional Pathways
Summary
Scientists found that tiny plastic pieces from agricultural plastic films prevent peanut plants from forming healthy partnerships with beneficial soil bacteria that help them grow. These microplastics disrupt the plant's natural processes and block the formation of root nodules, which are essential for peanuts to get nitrogen from soil bacteria. This matters because it shows how plastic pollution in farmland could reduce crop yields and food production, potentially affecting our food supply.
Polyethylene (PE) microplastics (MPs) from residual mulch films are prevalent in peanut-cultivated soils, yet their specific effects on peanut nodulation remain unclear. This study investigated the impacts of PE-MPs at concentrations of 0.2%, 0.6%, and 1.0% on peanut nodulation. Results indicated that PE-MPs significantly reduced peanut nodule number. Transcriptome analysis revealed that all three concentrations of PE-MPs down-regulated nodulation-related flavonoids, promoted lignin deposition in cell walls, disrupted antioxidant system, and enhanced the accumulation of antimicrobial substances, collectively impairing peanut nodulation efficiency. These findings indicate that PE-MPs substantially compromise the symbiosis between peanut and rhizobia, and provide insights into their interference with plant–beneficial microbe interactions in contaminated soils.
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