Comparative Analysis of Physiological Impact of gamma-Fe2O3 Nanoparticles on Dicotyledon and Monocotyledon

文献类型： 外文期刊

第一作者： Hu, Jing

作者： Hu, Jing;Wu, Chan;Li, Junli;Huang, Jin;Huang, Jin;Ren, Hongxuan;Wang, Yunqiang

作者机构：

关键词： gamma-Fe2O3 NPs;Physiological Impact;Dicotyledon;Monocotyledon

期刊名称：JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY （ 影响因子：1.134； 五年影响因子：0.999 ）

ISSN： 1533-4880

年卷期： 2018 年 18 卷 1 期

页码：

收录情况： SCI

摘要： Currently, the impact of nanoparticles (NPs) on plants is a provocative and promising field. As well-known, dicotyledon and monocotyledon show significant differences in the structural features of the roots and iron absorption mechanisms, and hence it is very meaningful to carry out the comparative study on the diverse impact of NPs on the physiological behaviors of monocotyledon and dicotyledon. In this study, two typical monocotyledon and dicotyledon crops, watermelon (Citrullus lanatus) and maize (Zea mays L.), were exposed to 0-100 mg/L iron oxide nanoparticles (gamma-Fe2O3 NPs). The physiological parameters, such as seed germination percentage, root lengths, malonaldehyde (MDA) contents, chlorophyll contents, ferric reductase activity, and iron contents of shoots and roots were determined. Transmission electron microscope (TEM) observations showed that gamma-Fe2O3 could enter both two plant root epidermis cell, but no translocation of gamma-Fe2O3 NPs from roots to shoots was found in the two plants. Results showed that 20 mg/L gamma-Fe2O3 NPs promoted seed germination of watermelon seeds by 14.5% and maize seeds by 10.1%, respectively. And 20 and 50 mg/L gamma-Fe2O3 NPs could accelerate root elongation of the two plants. Malondialdehyde (MDA) production, an indicator of lipid peroxidation, was no increased by exposure to 20-100 mg/L gamma-Fe2O3 NPs in watermelon plants, however, 100 mg/L gamma-Fe2O3 NPs initially induced an antioxidant defense in maize but then the stress was eliminated. 20-100 mg/L gamma-Fe2O3 NPs could increase the chlorophyll contents of watermelon during the duration of exposure, while chlorophyll contents of maize exposure to gamma-Fe2O3 NPs were higher than control in the first week but no positive effects were observed in the next two weeks. It's noteworthy that chlorophyll contents of maize were far higher than that of watermelon in the first week, which might be explained by the higher efficiency of iron uptake in strategy II plants.

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