ArticleCommunications biology2026
Microplastic and lead shift microbiomes enriching viral auxiliary metabolic genes for potential polylactic acid degradation.
Article in Communications biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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11 authors.
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Abstract
Biodegradable microplastics and heavy metals increasingly co-occur in soils through plastic mulching, organic amendments, and legacy metal contamination. Yet, their combined effects on soil-plant-microbiota interactions remain unclear, particularly for the virus. Here we evaluated the impacts of bio-MPs, polylactic acid (PLA), lead (Pb), and their combination on buckwheat and rhizosphere bacterial-viral communities. Co-contamination reduced soil pH and nutrient availability, increased Pb accumulation in plant tissues and suppressed buckwheat growth. Metagenomic analyses revealed that both bacterial and viral communities were altered under Pb-containing treatments. Bacterial genes associated with carbon and phosphorus metabolism were suppressed, while viral auxiliary metabolic genes (AMGs) related to carbon utilization were enriched, especially carbohydrate esterases that hydrolyze PLA ester bonds. A putative AMG-associated carbohydrate esterase gene (P9222_28545) was identified and the esterase activity confirmed via heterologous expression in E. coli. These findings highlight a potential role of viruses in mediating microplastic degradation in soils.
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