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Comparative impacts of iron oxide nanoparticles and ferric ions on the growth of Citrus maxima

文献类型： 外文期刊

作者： Hu, Jing 1 ; Guo, Huiyuan 3 ; Li, Junli 1 ; Gan, Qiuliang 1 ; Wang, Yunqiang 2 ; Xing, Baoshan 3 ;

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

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

3.Univ Massachusetts, Stockbridge Sch Agr, Amherst, MA 01003 USA

关键词： gamma-Fe2O3 NPs;Fe3+;Citrus maxima;Micronutrient;Impacts;Gene expression

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN：

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收录情况： SCI

摘要： The impacts of iron oxide nanoparticles (gamma-Fe2O3 NPs) and ferric ions (Fe3+) on plant growth and molecular responses associated with the transformation and transport of Fe2+ were poorly understood. This study comprehensively compared and evaluated the physiological and molecular changes of Citrus maxima plants as affected by different levels of gamma-Fe2O3 NPs and Fe3+. We found that gamma-Fe2O3 NPs could enter plant roots but no translocation from roots to shoots was observed. 20 mg/L gamma-Fe2O3 NPs had no impact on plant growth. 50 mg/L gamma-Fe2O3 NPs significantly enhanced chlorophyll content by 23.2% and root activity by 23.8% as compared with control. However, 100 mg/L gamma-Fe2O3 NPs notably increased MDA formation, decreased chlorophyll content and root activity. Although Fe3+ ions could be used by plants and promoted the synthesis of chlorophyll, they appeared to be more toxic than gamma-Fe2O3 NPs, especially for 100 mg/L Fe3+. The impacts caused by gamma-Fe2O3 NPs and Fe3+ were concentration-dependent. Physiological results showed that gamma-Fe2O3 NPs at proper concentrations had the potential to be an effective iron nanofertilizer for plant growth. RT-PCR analysis showed that gamma-Fe2O3 NPs had no impact on AHA gene expression. 50 mg/L gamma-Fe2O3 NPs and Fe3+ significantly increased expression levels of FRO2 gene and correspondingly had a higher ferric reductase activity compared to both control and Fe(II)-EDTA exposure, thus promoting the iron transformation and enhancing the tolerance of plants to iron deficiency. Relative levels of Nramp3 gene expression exposed to gamma-Fe2O3 NPs and Fe3+ were significantly lower than control, indicating that all gamma-Fe2O3 NPs and Fe3+ treatments could supply iron to C. maxima seedlings. Overall, plants can modify the speciation and transport of gamma-Fe2O3 NPs or Fe3+ for self-protection and development by activating many physiological and molecular processes. (C) 2016 Elsevier Ltd. All rights reserved.

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