River mud bacteria carry genes that break down plastic waste
Wen Y, Huang X, Zhang L, Zhang S, Li M
Soil Health
The same microbial tricks for chewing through plastic, breaking down fatty acids and oils, and metabolizing stubborn aromatic compounds are at work in garden soil, which is why healthy, diverse soil microbiomes matter even if you never see the organisms doing the job.
Researchers dug through the DNA of mud from a river estuary near a big city and found over 150 distinct microbial genomes living there. Forty-two of them carry genes that match known plastic-eating enzymes, and which microbes show up strongest changes with the seasons, rain versus dry weather shifts the mix of bacteria doing the work. It's a reminder that soil and sediment are packed with invisible workers whose jobs depend heavily on moisture, temperature, and nutrients, the same factors that shape what happens in a compost pile or a garden bed.
Key Findings
150 non-redundant microbial genomes were reconstructed, and 42 of them carried gene homologs matching known plastic-degradation enzymes in the PlasticDB database
About 60% of the plastic-gene-carrying genomes belonged to the bacterial group Pseudomonadota, with three Burkholderiaceae genomes carrying multiple candidate genes
Microbial community composition shifted by season: Priestia and Staphylococcus were more abundant in the dry season, while Vibrio, Photobacterium, Methylobacterium, and Ralstonia dominated the wet season, tracking changes in organic matter, pH, temperature, and nitrogen
chevron_right Technical Summary
Scientists scanned sediment from a heavily polluted river estuary in China and found dozens of microbes carrying genes that can break down plastic, with different species taking the lead depending on the season.
Abstract Preview
Original paper
Seasonal dynamics of plastic-degradation-associated microbiomes in an anthropogenically impacted Pearl River Estuary: A genome-resolved metagenomic study.
Estuarine sediments are important sinks for plastic debris and potential reservoirs of microbial functions involved in plastic transformation. Here, metagenomic sequencing and genome-resolved analy...
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