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Biodegradable MicroplasticDiversity Drives Soil CarbonLability via Phage-Boosted Bacterial Degradation of Recalcitrant Compounds
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Scientists found that when soil contains a greater variety of biodegradable microplastics (plastic bits meant to break down naturally), it speeds up how quickly soil carbon gets broken into simpler compounds, partly because tiny viruses that infect bacteria are helping them digest tough, hard-to-break-down organic matter. This matters because soil carbon storage helps regulate climate, and this research shows that even "eco-friendly" plastics can alter soil ecosystems in ways that may release stored carbon faster than expected, a reminder that biodegradable plastics aren't necessarily harmless as they break down in the environment
Abstract Microplastic (MP) pollution threatens soil carbon stability, yet the effects of diverse MPs, particularly biodegradable MPs, on the soil carbon cycle and the associated microbial mechanisms remain poorly understood. Here, we established a gradient of MP diversity to examine its impact on soil dissolved organic matter (DOM) chemodiversity, integrating multiomics analysis to reveal coupled bacterial and viral metabolic strategies. Our results revealed that elevated MP diversity increased the proportion of low-molecular-weight compounds among newly generated DOM, reducing DOM aromaticity and stability. The enrichment of genes related to recalcitrant organic compound degradation, coupled with decreased energy metabolism gene abundance, suggested that the bioprocessing efficiency was enhanced at the expense of bacterial proliferation, facilitating DOM conversion to bioavailable forms. Accordingly, elevated MP diversity remarkably increased the diversity of soil phages and strengthened phage–host interactions, which might reflect phage–host coadaptation. Importantly, the increased abundance of phage-encoded auxiliary metabolic genes, especially those related to recalcitrant organic compound degradation, might enhance the utilization of recalcitrant DOM by the host bacteria. Collectively, these findings advance our understanding of bacterial mechanisms underlying carbon dynamics following exposure to diverse MPs, highlighting the critical role of phage–host interactions during this process.
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From Microbes to Molecules: Biodegradable Microplastics Reshape Soil Carbon Metabolism and Composition of Dissolved Organic Matter
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"Biodegradable" plastics, often marketed as the eco-friendly alternative to regular plastic, actually shake up soil in bigger ways than conventional microplastics do—changing which microbes and viruses thrive there and how they break down carbon-containing matter. This matters because soil health underpins the food we eat and how well soil stores carbon, so before biodegradable plastics get widely used in farming, we need to understand their hidden effects on the soil ecosystems we depend on.
Phage Lysis Associated with Biodegradable Microplastics Mediates Microbial Physiological Adaptation to Transform Organic Matter in Soil
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A study of agricultural soil found that two biodegradable microplastics affected soil carbon differently by changing virus activity. One type reduced plant-based organic matter by boosting virus-caused bacterial die-off, while the other increased microbial-derived organic matter by helping surviving bacteria build new compounds from virus byproducts.
Soil viral–host interactions regulate microplastic-dependent carbon storage
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Researchers discovered that microplastics in soil affect carbon storage by changing how viruses and bacteria interact underground. Non-biodegradable microplastics reduced soil carbon by over 17%, while biodegradable ones slightly increased it, through different effects on microbial communities. This matters for human health because soil carbon cycling influences agricultural productivity and the broader climate system.
DroughtAmplifies Degradable Microplastic DiversityEffects on Soil Bacterial and Viral Ecology
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When soil is stressed by drought and contaminated with multiple types of "biodegradable" microplastics, it doesn't just harm soil health—it actually boosts the spread of antibiotic-resistant genes and disease-causing traits among soil bacteria and viruses. This matters because these plastics, often marketed as eco-friendly, may make soil ecosystems more prone to spreading antibiotic resistance, a risk that could eventually work its way into our food and water systems. The findings suggest that "biodegradable" doesn't automatically mean "harmless," especially when combined with other environmental stresses like drought.
Soil mineralogy and temperature modulate the effects of biodegradable microplastics on dissolved organic carbon in soils
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Scientists tested how "biodegradable" plastic particles break down in different types of soil and found they can actually release more carbon dioxide into the atmosphere than expected, especially in warmer temperatures. The plastic pieces also change the chemistry of soil in ways that could make it less healthy and stable over time. This matters because it suggests that biodegradable plastics may not be as environmentally friendly as we thought, and the tiny plastic particles could be affecting the soil that grows our food.
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