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Early-exposure legacy effects of polystyrene nanoplastics on lettuce: Trait-specific non-monotonic responses mask ionomic and antioxidant disruption
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Lettuce seedlings briefly exposed to tiny plastic particles (nanoplastics) during germination looked perfectly healthy weeks later—growing normally in size and leaf area—but hidden beneath that normal appearance was serious internal damage, including disrupted mineral balance (way too much calcium, too little phosphate) and stress responses lingering long after the plastic exposure ended. This matters because it means a lettuce plant could look fine on the outside while being nutritionally compromised on the inside, suggesting that current safety checks based on how crops look may not be enough to catch contamination from nanoplastics that are incre
The prevalence of polystyrene nanoplastics (PS-NPs) in agricultural ecosystems necessitates a detailed understanding of their impacts on crop development, physiology, and nutritional quality. However, while toxicological effects of nanoplastics are increasingly documented, the integrated and dose-dependent consequences of short-term early exposure across later developmental stages remain poorly understood. In this study, the morphological, biochemical, and ionomic responses of hydroponically grown lettuce (Lactuca sativa L. cv. ‘Red Little Gem’) to 50 nm PS-NPs were investigated at concentrations of 0, 1, 10, and 100 mg/L. Importantly, plants were exposed to PS-NPs only during the initial 7-day germination phase and were then transferred to a clean hydroponic system for a further 28 days, allowing the assessment of early-exposure legacy effects or stress memory. A low dose of exposure (1 mg/L) improved early germination kinetics while increasing seedling vigor, shoot biomass, and root fresh weight. Exposure to high quantities (100 mg/L) caused significant physiological stress, including reduced antioxidant capacity, increased catalase activity, and proline buildup. Furthermore, mineral analysis revealed a severe disruption of ion homeostasis under high exposure, including a dose-dependent depletion of phosphate and a five-fold increase in calcium. At 100 mg/L, visible development, including sustained root biomass and maximum leaf area growth, disguised significant internal stress signs and nutritional deficits. The findings show that focusing solely on macroscopic morphological criteria is insufficient to establish crop safety and that multi-domain physiological and ionomic frameworks must be employed to estimate actual agricultural dangers of nanoplastic contamination.
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Metabolic response of lettuce (Lactuca sativa L.) to polystyrene nanoplastics and microplastics after foliar exposure
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Researchers exposed lettuce plants to polystyrene nanoplastics and microplastics through their leaves and found that the particles altered the plant's metabolism differently depending on particle size. This foliar exposure pathway means that microplastics and nanoplastics settling on leafy vegetables from the air can change the plant's internal chemistry. Since lettuce is widely consumed raw, these metabolic changes raise questions about how microplastic-contaminated produce might affect nutritional quality and human health.
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.
Foliar-applied polystyrene nanoplastics (PSNPs) reduce the growth and nutritional quality of lettuce (Lactuca sativa L.)
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When lettuce plants were exposed to polystyrene nanoplastics sprayed on their leaves, they grew significantly smaller and produced less nutritious food, with reduced essential amino acids and micronutrients. The nanoplastics were absorbed through leaf pores and could travel down to the roots, causing oxidative stress throughout the plant. This study warns that airborne nanoplastic pollution could reduce both the quantity and nutritional quality of food crops.
Uptake, Distribution, and Impact of Micro- and Nano-Plastics in Horticultural Systems Using Lettuce (Lactuca sativa) as a Model Crop
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Researchers studied how micro- and nanoplastics are taken up and distributed in lettuce grown in horticultural systems, finding that nanopolystyrene exposures significantly inhibited leaf and root development in a concentration-dependent manner. They optimized extraction methods for quantifying microplastics in soil and developed a synthesis procedure for nanoplastic test particles. The study demonstrates that plastic fragments from horticultural materials can accumulate in soil and affect crop growth, raising concerns about food safety.
Polyethylene microplastic modulates lettuce root exudates and induces oxidative damage under prolonged hydroponic exposure
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Researchers grew lettuce in water containing polyethylene microplastics for 28 days and found that the plastics changed the chemical signals the roots released and caused oxidative damage in the leaves. While the plants looked mostly normal on the outside, the microplastics altered the root chemistry in ways that could affect nutrient uptake and plant defense. This is relevant to human health because lettuce is widely consumed and may be grown in microplastic-contaminated water or soil.
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