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Effect of surface coating and organic matter on the uptake of CeO2 NPs by corn plants grown in soil: Insight into the uptake mechanism

机译：表面涂层和有机物质对土壤中生长玉米植物CeO2 NPS摄取的影响：洞察摄取机理

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摘要

Little is known about the fate, transport, and bioavailability of CeO2 nanoparticles (NPs) in soil. Moreover, there are no reports on the effect of surface coating upon NPs uptake by plants. In this study, Zea mays plants were grown for one month in unenriched and organic soils treated with coated and uncoated CeO2 NPs. In addition, plants were exposed to fluorescein isothiocyanate (FITC)-stained CeO2 NPs and analyzed in a confocal microscope. In organic soil, roots from uncoated and coated NPs at 100, 200, 400, and 800 mg kg−1 had 40, 80, 130, and 260% and 10, 70, 90, and 40% more Ce, respectively, compared to roots from unenriched soil. Conversely, shoots of plants from unenriched soil had significantly more Ce compared with shoots from organic soil. Confocal fluorescence images showed FITC-stained CeO2 NP aggregates in cell walls of epidermis and cortex, suggesting apoplastic pathway. The μXRF results revealed the presence of CeO2 NP aggregates within vascular tissues. To the authors knowledge this is the first report on the effects of surface coating and organic matter on Ce uptake from CeO2 NPs and upon the mechanisms of CeO2 NPs uptake by higher plants
机译：关于土壤中CeO2纳米颗粒（NPS）的命运，运输和生物利用度，少人熟知。此外，没有关于表面涂层对植物吸收的影响的报道。在这项研究中，Zea Mays植物在未成分和用涂覆和未涂覆的CeO2 NPS处理的有机土壤中生长一个月。此外，植物暴露于荧光素异硫氰酸酯（FITC） - 染色的CeO2 NPS，并在共聚焦显微镜中分析。在有机土壤中，100,200,400和800mg kg -1 kg -1 / sup>的根部具有40,80,130和260％和10,70,90和40％与未成分土壤的根相比，更多CE。相反，与来自有机土壤的枝条相比，未成分土壤的植物射击显着更多。共聚焦荧光图像显示Featermis和皮质细胞壁中的FITC染色的CEO2 NP聚集体，表明痉挛性途径。 μXRF结果显示血管组织中CeO2 NP聚集体的存在。向作者知识，这是关于表面涂层和有机物对来自CEO2 NPS的CE吸收的影响的第一个报告，以及高等植物CEO2 NPS吸收的机制

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