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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 wear particles (TWPs) undergo intricate photoaging processes that substantially alter their physicochemical properties and enhance their environmental behavior and ecological effects. However, the combined effects of particle size and exposure concentration of photoaged TWPs on plant growth and rhizosphere microbial communities remain inadequately characterized. In this study, a 30-day tomato cultivation experiment was conducted using UV-aged TWPs of two sizes (100 and 200 μm) applied at two concentrations (0.1% and 1%, w/w). The results revealed distinct size- and concentration-dependent phytotoxicity. The highest concentration of 100 μm TWPs (1%, w/w) induced the most pronounced inhibitory effects, reducing shoot biomass by 77.1% and net assimilation rate by 62.1%, while increasing malondialdehyde (MDA) content by 72%. UV photoaging altered TWP surface morphology, chemical composition, and hydrophilicity, promoting the leaching of heavy metals. Furthermore, UV-aged TWPs disrupted soil nutrient cycling and enzyme activities, triggered extensive metabolic reprogramming in tomatoes, particularly in carbon metabolism and TCA cycle, and reduced rhizosphere bacterial and fungal diversity, shifting microbial communities toward more stress-tolerant taxa. Integrated analyses demonstrated that the phytotoxicity of UV-aged TWPs was linked to oxidative stress, metabolic disturbance, impaired soil function, and microbial community shifts. These findings advance the understanding of UV-aged TWP toxicity and underscore the necessity of incorporating particle size and aging status into environmental risk assessments.
More Papers Like This
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 particle and leachate induce oxidative stress and reshape the rice rhizosphere soil system: Multi-omics evidence of tissue-specific phytotoxicity
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Tiny particles that wear off car and truck tires are washing into soil and, this study finds, they can stress rice plants at high concentrations—damaging roots, disrupting their internal chemistry, and shifting the balance of soil microbes that plants depend on. Since rice is a staple food for billions, this raises questions about whether tire pollution building up in farmland soils could eventually affect crop health and food supplies, making it an environmental issue worth watching even though this study didn't directly test human health effects.
In Vitro Assessment Reveals the Effects of Environmentally Persistent Free Radicals on the Toxicity of Photoaged Tire Wear Particles
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Researchers examined how tire wear particles change when exposed to sunlight and found that the aging process generates environmentally persistent free radicals on their surfaces. These radicals significantly increased the toxicity of the particles in laboratory cell tests, causing oxidative stress and DNA damage. The study suggests that weathered tire particles may be more harmful than freshly released ones, adding a new dimension to microplastic pollution concerns.
Tire wear nanoparticles induce systemic metabolic disruptions and heavy metal accumulation in spinach
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Tiny particles from worn-down tires can get absorbed by spinach plants through both their roots and leaves, and this new study found that higher levels of these particles stunted plant growth while causing toxic metals like lead and cadmium to build up in the leaves we'd eat. Since tire dust from roads regularly ends up in soil and dust that settles on crops, this research raises concerns that produce grown near roadways could carry these unwanted heavy metals, making it an important food safety issue to watch as scientists learn more.
Tire wear nanoparticles induce systemic metabolic disruptions and heavy metal accumulation in spinach
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Tiny particles worn off car tires can end up in soil and get absorbed into spinach through both its roots and leaves, according to new research. At higher exposure levels, these tire particles stunted the plants' growth and caused them to soak up more toxic heavy metals like lead and cadmium into their leaves, meaning the leafy greens you eat could potentially carry contamination from road traffic pollution. While this study was done in a controlled pot experiment rather than real farm fields, it raises concerns about a previously overlooked way that everyday plastic pollution might be entering our food supply.
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