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

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• 作者：Lijuan Zhao^a ; Jose R. Peralta-Videa^a ; Armando Varela-Ramirez^c ; Hiram Castillo-Michel^d ; Chunqiang Li^e ; Jianying Zhang^c ; Renato J. Aguilera^c ; Arturo A. Keller^f ; Jorge L. Gardea-Torresdey^a ; ^b ; ^{jgardea@utep.edu}
• 关键词：CeO2 NPs ; Root uptake ; Translocation ; Fluorescence ; Zea mays
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：30 July, 2012
• 卷：225-226
• 期：Complete
• 页码：131-138
• 文件大小：1434 K

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^鈭? 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 渭XRF 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.