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Tire Wear Particles Inhibit Tomato Growth and Disrupt Rhizosphere Microbial Function
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Scientists found that tiny particles from tire wear can seriously harm tomato plants, reducing their growth by more than half and disrupting the helpful bacteria in soil. The smallest tire particles (100 micrometers) were the most toxic, damaging the plants' ability to photosynthesize and creating harmful stress in their cells. This matters because these tire particles are everywhere in our environment and could reduce crop yields while making soil less healthy for growing the food we eat.
Tire wear particles (TWPs), a widespread source of microplastic pollution, may pose ecological risks to terrestrial agroecosystems due to their persistence and chemical additives. However, their mechanisms in soil-plant systems remain poorly understood. A 30 day pot experiment investigated the effects of TWPs (100, 150, and 200 μm; 0.1 and 1%, w/w) on tomato (Solanum lycopersicum) growth, oxidative stress (MDA, H2O2, and O2-), soil enzymes (dehydrogenase, urease, and sucrase), and microbial communities. The smallest (100 μm) TWPs induced the strongest phytotoxicity (up to 55% biomass reduction, impaired photosynthesis, and elevated oxidative markers). High-dose (1%, w/w) 100 μm TWPs reduced soil nutrients and suppressed key enzyme activities. They also enriched stress-tolerant microbes (Actinobacteriota and Bacteroidota) while decreasing beneficial decomposers (Mortierella), disrupting microbial networks, and reducing modularity. Our findings highlight the particle-size-dependent toxicity of TWPs, which could adversely affect crop productivity and undermine soil ecosystem stability.
More Papers Like This
Photoaging-induced phytotoxicity of tire wear particles on tomato (Solanum lycopersicum L.): Evidence from oxidative stress, metabolic reprogramming, and microbial shifts
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Tiny bits of tire dust that wash into soil get even more toxic after sitting in the sun, according to a new study on tomato plants. Sun-damaged tire particles leached more heavy metals, stunted tomato growth by up to 77%, and disrupted the helpful soil microbes plants need, raising concerns about how this widespread pollutant, which comes from everyday road traffic, could affect the food we grow. While this study looked at plant health rather than direct human effects, it's a reminder that tire particles are an underexamined source of contamination in the soil where our food comes from.
Tire abrasion particles negatively affect plant growth even at low concentrations and alter soil biogeochemical cycling
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Researchers found that tire abrasion particles—a major source of microplastic pollution on land—negatively affected plant growth and disrupted soil nutrient cycling even at low concentrations. This is concerning because tire particles are shed in enormous quantities on roads and accumulate in roadside soils where plants grow.
Tire abrasion particles negatively affect plant growth even at low concentrations and alter soil biogeochemical cycling
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Tire wear particles at environmentally relevant concentrations reduced plant growth, lowered seed germination rates, and altered soil nitrogen and carbon cycling biogeochemical processes even at the lowest doses tested, suggesting that tire-derived microplastics pose a real risk to terrestrial plant productivity and ecosystem function.
Beyond Microplastics: How Tire Wear Particles Influence Plant Performance
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Scientists reviewed research on tiny particles that come off car tires when we drive, which end up in soil everywhere and are different from regular plastic pollution. These tire particles release toxic chemicals that can harm plants by damaging their roots and changing the soil around them, which could affect our food supply. This matters because tire pollution is everywhere but has been overlooked compared to other types of plastic pollution, and we need more research to understand the long-term risks to crops and ecosystems.
Data from: Tire wear particles impacting a roadside wild plant species
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Tiny particles worn off car tires as they drive are already known to harm water life, but this study shows they also stunt the growth of roadside plants and cause stress damage in their roots. Since these plants line our streets and parks, this research raises early questions about how tire pollution might affect the green spaces we walk through every day—though more research is needed to know what this means for human health directly.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.