Li Xiaoping, Peng Liyuan, Cai Yue, He Feng, Zhou Qishang, Shi Danqian
Department of Environmental Science, School of Geography and Tourism, Shaanxi Normal University, Xi'an, Shaanxi 710062, PR China.
International Joint Research Centre of Shaanxi Province for Pollutant Exposure and Eco-environmental Health, Xi'an, Shaanxi 710062, PR China.
J Agric Food Chem. 2023 Mar 15;71(10):4235-4248. doi: 10.1021/acs.jafc.2c06843. Epub 2023 Feb 28.
PbO (PbO and PbO, = 1, 2) nanoparticles are emerging contaminants in dust, soil, and water due to extensive application of commercial lead products. As far as we know, the current studies are first conducted to understand the phytotoxic effects of PbO (10 ± 3 nm) and PbO NPs (20 ± 5 nm) on maize ( L.) grown in hydroponic treatments. The exposure assays indicated that phytotoxic effects were dose- and size-dependent on PbO NPs. Water uptake would be the crucial mechanism to govern the effects of PbO on maize seed germination and root elongation, while the nanosize of particles and water transpiration processes would control maize growth and biomass production. PbO NPs significantly influenced the macro- and micronutrients in roots and shoots of maize and significantly affected the maize growth and grain development. Our findings provide clear-cut evidence that PbO/PbO NPs can bioaccumulate in maize cell organelles via apoplastic and symplastic routes from the seed and root pathways along with water uptake and transportation. The significance of this research elucidates the impacts of PbO/PbO NPs on food security and indicates the threat of emerging PbO/PbO NPs to human dietary health.
由于商业铅产品的广泛应用，氧化铅（PbO，其中 = 1, 2）纳米颗粒已成为灰尘、土壤和水中的新兴污染物。据我们所知，目前首次开展研究以了解水培处理中氧化铅（10 ± 3 纳米）和氧化铅纳米颗粒（20 ± 5 纳米）对玉米（ L.）的植物毒性效应。暴露试验表明，植物毒性效应在剂量和尺寸上依赖于氧化铅纳米颗粒。水分吸收将是控制氧化铅对玉米种子萌发和根伸长影响的关键机制，而颗粒的纳米尺寸和水分蒸腾过程将控制玉米的生长和生物量生产。氧化铅纳米颗粒显著影响玉米根和芽中的大量和微量营养素，并显著影响玉米生长和籽粒发育。我们的研究结果提供了明确的证据，表明氧化铅/氧化铅纳米颗粒可通过质外体和共质体途径，从种子和根部途径伴随水分吸收和运输在玉米细胞器中生物累积。本研究的意义阐明了氧化铅/氧化铅纳米颗粒对粮食安全的影响，并表明新兴的氧化铅/氧化铅纳米颗粒对人类膳食健康的威胁。
