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Interaction mechanisms between alpha-Fe2O3, gamma-Fe2O3 and Fe3O4 nanoparticles and Citrus maxima seedlings

文献类型： 外文期刊

作者： Li, Junli 1 ; Hu, Jing 1 ; Xiao, Lian 1 ; Wang, Yunqiang 2 ; Wang, Xilong 3 ;

作者机构： 1.Wuhan Univ Technol, Sch Chem Chem Engn & Life Sci, Wuhan 430070, Hubei, Peoples R China

2.Hubei Acad Agr Sci, Inst Econ Crops, Wuhan 430064, Hubei, Peoples R China

3.Peking Univ, Coll Urban & Environm Sci, Lab Earth Surface Proc, Beijing 100871, Peoples R China

关键词： Interaction; Mechanism; Iron oxide nanoparticles; Citrus maxima Seedling; Enzyme activity; Gene expression

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2018 年 625 卷

页码：

收录情况： SCI

摘要： The interactions between alpha-Fe2O3, gamma-Fe2O3, and Fe3O4 nanoparticles (NPs) and Citrus maxima seedlings were examined so as to better understand possible particle applications as an Fe source for crop plants. NPs toxicity to the exposed plant was investigated as well. The alpha- and gamma-Fe2O3 NPs were accumulated by plant root cells through diapirism and endocytosis, respectively, but translocation to the shoots was negligible. Analysis of malondialdehyde (MDA), soluble protein content, and antioxidant enzyme activity revealed that Fe deficiency induced strong oxidative stress in Citrus maxima seedlings, which followed an order of Fe deficiency > Fe3+ > alpha-Fe2O3, gamma-Fe2O3 NPs > Fe3O4 NPs. However, the chlorophyll leaf content of plants exposed to alpha-Fe2O3, gamma-Fe2O3, Fe3O4 NPs and Fe3+ were significantly reduced by 31.1%, 14.8%, 18.8% and 22.0%, respectively, relative to the control. Furthermore, RT-PCR analysis revealed no up-regulation of AHA and Nramp3 genes in Citrus maxima roots; however, the relative FRO2 gene expression upon exposure to iron oxide NPs was 1.4-2.8-fold higher than the control. Ferric reductase activity was consistently enhanced upon iron oxide NPs exposure. These findings advance understanding of the interaction mechanisms between metal oxide NPs and plants, and provide important knowledge need for the possible application of these materials in agriculture. (C) 2017 Elsevier B.V. All rights reserved.

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