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Comparative Phytotoxicity of Leachates from Aircraft and Automobile Tire Wear Particles on Mung Bean (Vigna radiata L.) Seed Germination and Seedling Growth
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Tiny particles that wear off airplane and car tires end up in soil and water, and this study found both types harm plant growth—but airplane tire particles are worse, causing more stress damage and slower growth in test plants. The culprits seem to be zinc and special chemicals used in aircraft tires, suggesting that as microplastic pollution spreads through our environment and food chain, not all sources are equally risky, and airplane tire debris may deserve closer attention and stricter regulation.
Tire wear particles (TWPs) are a significant source of microplastics and chemical additives in the environment; however, differences in the toxicity of particles from different vehicle types remain unclear. This hydroponic study compared the phytotoxicity of leachates from aircraft- and automobile-derived TWPs on mung bean. Both leachates inhibited seed germination and seedling growth, with aircraft TWP leachates showing stronger effects, including greater germination delays and more pronounced reductions in shoot height, root length, and root surface area. Physiological analyses revealed that TWP leachates induced oxidative stress, characterized by significant suppression of superoxide dismutase (SOD) activity, compensatory increases in catalase (CAT) and peroxidase (POD) activities, and marked accumulation of malondialdehyde (MDA), indicating severe membrane lipid peroxidation. Chlorophyll content decreased in all groups, with greater reductions under aircraft leachates. Toxicological Priority Index (ToxPi) modeling identified zinc as the shared primary risk factor, while aircraft tire-specific additives (e.g., dicyclohexylamine, 1,2-dihydro-2,2,4-trimethylquinoline) constituted a distinct risk component linked to differentiated formulations. Aircraft TWP leachates thus exhibit stronger phytotoxicity through multiple pathways. These findings support refined environmental risk assessment and targeted control measures for aircraft TWPs.
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Researchers grew mung bean plants for a full lifecycle in soil contaminated with tire wear particles and nickel, finding that tire particles alone reduced crop yields by up to 52%. When combined with high levels of nickel, a heavy metal, yields dropped by as much as 88%. This study shows that tire-derived microplastics in agricultural soil can significantly reduce food production and, when mixed with other pollutants, the damage is far worse than either contaminant alone.
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Researchers compared how tire particles and tire leachate affect two crop species, finding that tomatoes mount a successful antioxidant defense and maintain growth while mung beans suffer severe oxidative damage and chlorophyll loss, and that the water-soluble leachate fraction poses the greatest acute risk — underscoring the need for species-specific risk assessment of tire-derived pollution near agricultural land.
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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.
[Effects of Tire Wear Particles on Seedling Growth of Kidney Bean （Phaseolus vulgaris L.） and Soil Antibiotic Resistance Gene Abundance].
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Researchers studied how tire wear particles, a major source of microplastics, affect kidney bean seedling growth and antibiotic resistance genes in soil. The study found that tire wear particles impaired root development by up to 49% and fresh weight by up to 48%, while also significantly increasing the abundance of antibiotic resistance genes in soil, including high-risk genes linked to drug-resistant bacteria.
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.
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