Impacts of microplastics on rhizosphere microbiome structure and function: a systematic review.
Mehdizadeh M, Omidi A, Abideen Z, Morya S, Al-Taey DKA
Soil Health
The invisible microbial community hugging your vegetable roots — the living network that feeds your tomatoes nitrogen and helps them shrug off drought — is being quietly dismantled by plastic fragments breaking down in your soil every time you use plastic mulch or amend with compost contaminated by plastic packaging.
Soil around plant roots is teeming with helpful bacteria and fungi that act like a plant's personal support crew, delivering nutrients and fighting disease. When tiny plastic pieces — smaller than a sesame seed — build up in that soil, they scramble this crew: helpful members disappear and less useful bacteria move in. Surprisingly, plastics marketed as 'biodegradable' caused just as much disruption, sometimes more, than regular plastic.
Key Findings
Bacterial richness dropped 9–10% when plants were exposed to high concentrations of polylactic acid (PLA) — a common 'biodegradable' plastic — showing eco-friendly plastics are not necessarily soil-safe.
Beneficial plant-growth-promoting bacteria declined significantly (p < 0.05) when microplastics were combined with antibiotics, suggesting real-world co-contamination scenarios may be especially harmful.
Biodegradable microplastics (PLA, PBAT) shifted microbial communities toward fast-growing, nutrient-hungry bacteria and disrupted genes responsible for soil nutrient cycling, altering fundamental soil fertility processes.
chevron_right Technical Summary
Tiny plastic particles in garden and farm soil disrupt the community of beneficial microbes around plant roots, weakening plants' ability to absorb nutrients and cope with stress. A review of 32 studies found that even 'biodegradable' plastics cause serious damage — and the full long-term consequences are still unknown.
Abstract Preview
The pervasive contamination of agricultural soils by microplastics (MPs) represents a significant environmental stressor with potential repercussions for the rhizosphere microbiome, a critical inte...
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Microplastic contamination refers to the presence of tiny plastic particles (typically under 5mm) in soil and water environments, often originating from the breakdown of larger plastic debris or synthetic agricultural materials. For plant science, this is a critical area of study because
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