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The impact of leachate from waste rubber particles on duckweed: growth, oxidative stress, and cell structure
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Researchers exposed duckweed plants to liquid runoff from waste rubber particles, a source of microplastic pollution, at different concentrations. Higher concentrations reduced root growth and activity, caused cell damage, and triggered stress responses including harmful molecule buildup and cell death in the plants.
Waste rubber particles, especially tire wear particles (TWPs), have become major contributors to microplastic pollution. Through rainwater and road runoff, TWPs can enter the water environment, posing potential threats to aquatic organisms. However, systematic research on the effects of waste rubber particles on duckweed remains limited. Thus, Spirodela polyrhiza was exposed to rubber leachate at 10%, 15%, 20%, and 25% levels, aiming to evaluate the effects of rubber leachates on duckweed at the individual, physiological, and cellular levels. The results showed that rubber leachates significantly inhibited duckweed growth and reproduction. Exposure to the 25% leachate significantly reduced root length, root volume, and root activity of duckweed plants by 74.6%, 63.9%, and 29.7% ( p < 0.05), respectively. Leachate exposure also induced the accumulation of osmoprotectants, with significant increases of soluble sugars (170.7%, p < 0.05) and proline content (73.6%, p < 0.05) under the 25% treatment. This was accompanied by reactive oxygen species (ROS) overproduction, reflected in significantly elevated superoxide anion and hydrogen peroxide contents in root tips. Furthermore, the leachates induced oxidative stress in duckweed, as evidenced by increased antioxidant enzyme activities and antioxidant contents. In addition, the leachates compromised the integrity of both cell and mitochondrial membrane, reduced cell wall component contents, and induced apoptosis. Collectively, these findings demonstrate that the toxicity of rubber leachates is mediated through oxidative stress and cellular structural damage.
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Researchers studied the effects of tire microplastics and their chemical leachates on duckweed, a common aquatic plant, and its associated bacteria. They found that both the particles themselves and the chemicals they release into water harmed plant growth, altered physiological responses, and shifted the bacterial communities living on the plant surfaces. The study reveals that tire-derived pollution affects aquatic ecosystems through multiple pathways beyond just the physical presence of plastic particles.
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Researchers investigated how tire wear microplastics affect the growth and ecological interactions of duckweed, a common aquatic plant. They found that untreated and aged tire particles had the most harmful effects, reducing plant growth and impairing root development, while hydrated particles were less damaging. The study reveals that the condition of tire wear microplastics when they enter waterways significantly influences their impact on aquatic plant life.
The effect of microplastics on oxidative stress appearance and activity of antioxidant enzymes in duckweed (Lemna minor L.)
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Researchers examined the effects of microplastics on oxidative stress and antioxidant enzyme activity in ducks, finding that microplastic exposure triggered measurable changes in oxidative balance and enzymatic defenses. The study contributes evidence that microplastic ingestion induces biochemical stress responses in avian species exposed through contaminated aquatic environments.
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