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Foliar implications of polystyrene nanoplastics on leafy vegetables and its ecological consequences
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Scientists applied polystyrene nanoplastics to four common leafy vegetables and found that the tiny particles accumulated on leaf surfaces, particularly around the pores plants use to breathe. This accumulation reduced the plants' chlorophyll content and ability to photosynthesize, affecting their growth and nutritional quality. The findings raise concerns that airborne nanoplastic pollution could compromise the safety and nutritional value of the vegetables people eat.
The rise of airborne micro-nanoplastics (MNPs) pollution poses a significant threat to agroecological systems. Despite this issue, there is a critical gap in our understanding of their specific effects on various leafy vegetable species. To address this, we conducted a controlled experiment applying Polystyrene Nanoplastics (PS-NPs) on four leafy vegetables: Brassica rapa var. chinensis, B. rapa var. parachinensis, Amaranthus viridis, and Allium tuberosum. Our results showed that PS-NPs tend to accumulate within the epidermal layers and cuticles of these vegetables, particularly around stomatal apertures. More PS-NPs were found on the adaxial and abaxial side of leaves, compared to the cross-section. The abundance of PS-NPs accumulations varied significantly among the studied species due to differences in leaf structure. Notably, leaves with trichomes trapped more PS-NPs particles. These accumulation significantly reduced chlorophyll content and photosynthetic rates, altering the growth and nutritional quality of the vegetables. Our findings reveal the ecological effects of PS-NPs on the nutrient content, phenotype, physiology, growth and biomass metrics of common leafy vegetables. This highlights the potential for PS-NPs accumulation in edible plant tissues, raising concerns about food security and human health.
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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.
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.
Transport Dynamicsand Physiological Responses ofPolystyrene Nanoplastics in Pakchoi: Implications for Food Safetyand Environmental Health
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Researchers tracked the transport and physiological responses of polystyrene nanoplastics in pakchoi (bok choy) plants, finding that nanoplastics were absorbed through roots and translocated to shoots where they disrupted chlorophyll production and reduced plant growth.
Physiological response of cucumber (Cucumis sativus L.) leaves to polystyrene nanoplastics pollution
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Researchers exposed cucumber plants to polystyrene nanoplastics of four different sizes and found significant effects on photosynthesis, antioxidant systems, and sugar metabolism in the leaves. Smaller particles tended to reduce chlorophyll and photosynthetic activity, while larger particles triggered stronger oxidative stress responses. The study suggests that nanoplastic contamination in farmland soils could impair crop growth through multiple biochemical pathways.
Polystyrene nanoplastics' accumulation in roots induces adverse physiological and molecular effects in water spinach Ipomoea aquatica Forsk
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Researchers exposed water spinach to polystyrene nanoplastics in a hydroponic experiment and tracked where the particles accumulated in the plant. They found that nanoplastics built up primarily in the roots, causing reduced growth, impaired photosynthesis, and disrupted antioxidant defense systems. The study raises concerns about nanoplastic uptake by edible aquatic vegetables and the potential implications for food safety.
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