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Impacts of microplastics on rhizosphere microbiome structure and function: a systematic review
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Microplastics in soil—even the "biodegradable" kind marketed as eco-friendly—can disrupt the helpful bacteria that live around plant roots and support crop growth and nutrition, according to this review of 32 studies. Since these microbes help plants take up nutrients and resist stress, this raises concerns about long-term food quality and soil health, though most studies used high microplastic doses over short time periods, so more real-world research is needed before drawing firm conclusions about your dinner plate.
The pervasive contamination of agricultural soils by microplastics (MPs) represents a significant environmental stressor with potential repercussions for the rhizosphere microbiome, a critical interface for plant health and soil fertility. This systematic review synthesizes findings from 32 primary studies to evaluate MP-induced stress and its impacts on rhizosphere microbial communities. The evidence consistently demonstrates that microplastics significantly alter microbial community structure, with the majority of studies reporting substantial shifts in beta diversity. The effects on alpha diversity were context-dependent, varying with factors such as polymer type, concentration, and the presence of co-stressors; studies reported both significant decreases (a 9-10% reduction in bacterial richness with 100,000 mg kg polylactic acid (PLA) MPs) and increases. A critical finding was the marked reduction in beneficial microbial guilds; for instance, specific plant growth-promoting rhizobacteria (PGPR) genera declined significantly (p < 0.05) under combined MP and antibiotic stress. Furthermore, biodegradable microplastics (BMPs; e.g., PLA, poly(butylene adipate-co-terephthalate (PBAT)) induced equally potent or more severe disruptions than conventional polymers, often enriching copiotrophic bacteria and altering functional gene profiles for nutrient cycling. Under the high‑dose, short‑term experimental conditions reviewed, these perturbations compromise plant nutrient acquisition and stress resilience; however, whether such effects scale to environmentally realistic microplastic concentrations remains an open question, necessitating caution when extrapolating to long‑term agricultural sustainability. The review underscores the urgent need for field-relevant, long-term studies to fully understand the ecological risks posed by MPs in terrestrial ecosystems.
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Biodegradable and conventional microplastics affect soil-plant systems through altering microbial community assembly and functions
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"Biodegradable" plastics are often marketed as the eco-friendly choice, but this study found that when they break down into microplastics in soil, they actually harm plant growth and soil health more than regular plastics like polyethylene do, by disrupting the soil bacteria that plants depend on for nutrients. This matters because these microplastics could end up in the crops we eat, and it suggests that switching to "biodegradable" plastics isn't automatically a safer bet for our food supply without more research into how they actually break down in real farm soil.
A Comprehensive Review on Changes in Rhizosphere Soil Mediated by Microplastics: Soil Property, Microbial Gene Expression and Crop Growth
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Tiny plastic particles from farm plastics, fertilizers, and polluted water are building up in agricultural soil, and this review pulls together existing research showing they can disrupt soil bacteria and fungi, harm soil creatures like worms, and interfere with how crops absorb nutrients and grow. While scientists haven't yet directly studied how this affects the safety or nutritional quality of the food we eat, these soil disruptions raise real questions about the long-term health of our food supply. More research is needed to understand exactly how microplastic pollution in farmland could eventually reach our dinner plates.
Biodegradable microplastics disrupt root exudate driven plant–microbe interactions, compromising plant growth and rhizosphere microenvironment health
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"Biodegradable" plastics are often marketed as eco-friendly alternatives to regular plastic, but new research shows their microscopic fragments can still harm plants: tomato plants grown in soil contaminated with these bio-microplastics grew worse and lost beneficial soil bacteria that normally help roots absorb nutrients and fight off stress. This matters because these same crops are part of our food supply, so if biodegradable plastics are quietly disrupting plant health and soil ecosystems, that's a warning sign that "biodegradable" doesn't automatically mean "harmless" for the food we eat.
The Structural and Functional Responses of Rhizosphere Bacteria to Biodegradable Microplastics in the Presence of Biofertilizers
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Researchers studied how biodegradable microplastics interact with biofertilizers in crop soils and found that even though biodegradable plastics are designed as greener alternatives, they still significantly altered soil bacterial communities and disrupted carbon metabolism pathways. The findings suggest that biodegradable microplastics may affect soil health differently than conventional plastics, but are not necessarily harmless.
Microplastic: Evaluating the Impact on Soil-Microbes and Plant System
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This review examines how microplastics affect soil microbial communities and plant systems in agricultural settings, documenting impacts on soil health, microbial diversity, and crop physiology. As microplastics accumulate in farmland soils through irrigation, sludge application, and plastic mulches, their effects on the soil ecosystem that underpins food production are a growing concern.
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