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Nanoplastic Aggregation Driven by Environmental Components Reshapes Hormone Signaling and Energy Metabolism in Lactuca sativa
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Researchers found that environmentally driven aggregation of nanoplastics governs their toxicity to lettuce, with large aggregates causing up to 71% increases in oxidative stress markers and significant growth inhibition while small or dispersed aggregates produced only mild adaptive responses—showing that aggregate size, not just concentration, must be factored into ecological risk assessments.
increased by up to 71.0%) and growth inhibition, whereas dispersed or small aggregates (Dh ≈ 160 nm) elicited only mild adaptive stress responses. Integrated metabolomic and transcriptomic analyses revealed aggregation-dependent molecular responses, with large aggregates triggering a defense-prioritized regulatory shift. Thus, environmental component-mediated aggregation governs plant toxicity and should be considered in practical risk assessments.
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The dosage- and size-dependent effects of micro- and nanoplastics in lettuce roots and leaves at the growth, photosynthetic, and metabolomics levels
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Researchers studied the effects of polyethylene micro- and nanoplastics on lettuce plants, varying both particle size and concentration. They found that particle size played a pivotal role in influencing plant growth, photosynthetic activity, and metabolic processes, with nanoplastics generally causing more pronounced effects than larger microplastics. The study suggests that the smallest plastic particles pose the greatest risk to crop health by disrupting plant physiology at multiple levels.
Nanoplastics Aggregation in Environment: Analytical Methods and Environmental Implications
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This review examines how nanoplastics aggregate in the environment—clumping together or attaching to other particles—and how this affects their analysis and ecological impact. Aggregation changes how nanoplastics move through water and accumulate in organisms, complicating risk assessment for these extremely small plastic particles.
Toxic effects and mechanisms of engineered nanoparticles and nanoplastics on lettuce (Lactuca sativa L.)
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Researchers compared the effects of engineered nanoparticles and polystyrene nanoplastics on lettuce and found that all types caused oxidative stress in roots at high concentrations. Each nanoparticle type triggered different defensive metabolic pathways in the plants, and nanoplastics specifically altered amino acid and vitamin metabolism. Since lettuce is widely consumed raw, these findings raise questions about how nanoplastic contamination in agricultural soil could affect the safety of leafy vegetables.
Effect of Dry Soil Aggregate Size on Microplastic Distribution and Its Implications for Microplastic Emissions Induced by Wind Erosion
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Researchers investigated the aggregation behavior and toxicity of polyethylene terephthalate nanoplastics in freshwater under varying pH and ionic conditions, finding that aggregation reduced acute toxicity to Daphnia magna but increased sedimentation and benthic exposure. Environmental chemistry strongly mediates nanoplastic risk.
Size-, Shape-, and Number Concentration-Dependent Nanoplastics Accumulation and Growth Responses in Lettuce
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Scientists found that tiny plastic particles (nanoplastics) can be absorbed by lettuce through its roots and travel up into the leaves we eat, with smaller, rounder particles getting into the plant more easily while sharp, jagged particles caused more physical damage to the roots. This matters because it shows that plastic pollution shape and size—not just how much plastic is present—affects how much ends up in our food, which is an important piece of the puzzle as researchers work to understand how microplastics in produce might affect human health.
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