Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education (MOE)/Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Key Laboratory of Environmental Remediation and Ecosystem Health, Ministry of Education (MOE), College of Environmental and Resources Sciences, Zhejiang University, Hangzhou, 310058, China.
Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education (MOE)/Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
Environ Pollut. 2021 Jul 1;280:116978. doi: 10.1016/j.envpol.2021.116978. Epub 2021 Mar 20.
Currently, there is a lack of information about the influence of foliar-applied nanoplastics on crop growth and nutritional quality. To fill the knowledge gap, soil-grown lettuces (Lactuca sativa L.) were foliar-exposed to polystyrene nanoplastics (PSNPs) at 0, 0.1 and 1 mg/L for one month. Foliar exposure to PSNPs significantly decreased the dry weight, height, and leaf area of lettuce by 14.3%-27.3%, 24.2%-27.3%, and 12.7%-19.2%, respectively, compared with the control. Similarly, plant pigment content (chlorophyll a, b and carotenoid) was considerably reduced (9.1%, 8.7%, 12.5%) at 1 mg/L PSNPs. However, the significant increase in electrolyte leakage rate (18.6%-25.5%) and the decrease in total antioxidant capacity (12.4%-26%) were the key indicators of oxidative stress in lettuce leaves, demonstrating the phytotoxicity of PSNPs by foliar exposure. In addition, the remarkable reduction in micronutrients and essential amino acids demonstrated a decrease in nutritional quality of lettuce caused by PSNPs. Besides, SEM and TEM analysis indicated the possible absorption of PSNPs through leaves stoma and the translocation downwards to plant roots. This study provides new information about the interaction of airborne NPs with plants. It also warns against atmospheric NPs pollution that the adverse effects of airborne NPs on crop production and food quality should be assessed as a matter of urgency.
目前，关于叶面施加的纳米塑料对作物生长和营养质量的影响的信息还很缺乏。为了填补这一知识空白，我们将土壤中生长的生菜叶面暴露于聚苯乙烯纳米塑料（PSNPs）浓度为 0、0.1 和 1 mg/L 下一个月。与对照组相比，叶面暴露于 PSNPs 使生菜的干重、高度和叶面积分别降低了 14.3%-27.3%、24.2%-27.3%和 12.7%-19.2%。同样，植物色素含量（叶绿素 a、b 和类胡萝卜素）在 1 mg/L PSNPs 时显著降低（9.1%、8.7%、12.5%）。然而，电解质泄漏率（18.6%-25.5%）的显著增加和总抗氧化能力（12.4%-26%）的降低是生菜叶片氧化应激的关键指标，表明 PSNPs 通过叶面暴露具有植物毒性。此外，微量营养素和必需氨基酸的显著减少表明 PSNPs 导致生菜营养质量下降。此外，SEM 和 TEM 分析表明 PSNPs 可能通过叶片气孔被吸收，并向下转运到植物根部。本研究提供了关于空气传播纳米颗粒与植物相互作用的新信息。它还警告了大气纳米颗粒污染，空气中纳米颗粒对作物生产和食品质量的不利影响应作为紧急事项进行评估。
