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Microplastics disrupt nitrogen-fixing bacterial community with consequences for plant growth
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Microplastics disrupt the nitrogen-fixing bacterial community with consequences for plant growth
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Tiny plastic fibers in soil can mess with the helpful bacteria that plants rely on to pull nitrogen from the air, a process crucial for healthy growth, but the effects depend on the type of plastic, with some helping and others hurting root growth or the bacterial partnerships plants need. This matters because as plastic pollution builds up in farmland, it could quietly disrupt the natural systems that keep our food crops fed and healthy, even before we fully understand the ripple effects on the food we eat.
Microplastic Alters Rhizosphere Microbiome: A Review
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Researchers review how microplastic accumulation in soil disrupts the rhizosphere microbiome — the community of beneficial microorganisms surrounding plant roots — impairing nutrient uptake and pathogen resistance in ways that could threaten agricultural productivity and soil ecosystem health.
Microplastics modify the microbial-mediated carbon metabolism in mangroves
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Researchers exposed mangrove rhizosphere microbial communities to four types of microplastics in microcosm experiments and found that polyamide and PVC microplastics reduced microbial utilization of preferred carbon sources by up to 67%, while polyethylene exposure altered nitrogen-containing carbon metabolism. These disruptions to carbon and nitrogen cycling raise concerns about microplastics impairing the critical carbon sequestration function of mangrove ecosystems.
Bacterial communities on microplastics in a wetland ecosystem
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Analysis of bacterial communities on microplastics in Poyang Lake, China's largest freshwater lake, found that MP surfaces host distinct microbial assemblages with lower diversity but unique taxa enriched with Pseudomonas, and that MPs facilitate bacterial exchange between water and sediment. The plastisphere — the microbial community colonizing MP surfaces — may serve as a vector for pathogens and disease-associated microbes, raising concerns about ecological disruption and indirect human health risks through contaminated freshwater.
The regulated effects of phosphorus addition on rhizosphere microecology under microplastic pollution: a comparison based on different plant types
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A pot experiment found that polyethylene microplastics and phosphorus fertilizers interact in crop-specific ways, altering root growth and soil moisture differently in wheat versus maize. Understanding these interactions matters because microplastic contamination in farmland soils could undermine fertilizer strategies and threaten crop productivity.
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