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Carbon dots alleviate the toxicity of cadmium ions (Cd2+) toward wheat seedlings

文献类型： 外文期刊

作者： Xiao, Lian 1 ; Guo, Huiyuan 2 ; Wang, Shouxia 1 ; Li, Junli 1 ; Wang, Yunqiang 3 ; Xing, Baoshan 2 ;

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

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

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

期刊名称：ENVIRONMENTAL SCIENCE-NANO （ 影响因子：8.131； 五年影响因子：8.3 ）

ISSN： 2051-8153

年卷期： 2019 年 6 卷 5 期

页码：

收录情况： SCI

摘要： Heavy metal pollution poses great toxicity to plants, which makes methods to mitigate the heavy metal-induced toxicity desirable. This study explored the efficacy of carbon dots (CDs) in reducing the toxicity of cadmium ions (Cd2+) to wheat seedlings after 5 days of hydroponic exposure. When treated with Cd2+, the addition of CDs (50 and 75 mg L-1) can significantly reduce the cadmium content (33.1-57.7%) in the roots and leaves. Adsorption experiments proved that CDs could adsorb Cd2+. The physiological results showed that Cd2+ at 50 mg L-1 reduced the shoot length (32.4 +/- 5.2%) of wheat, increased the content of soluble sugar and soluble protein, and increased APX, CAT and POD activity in wheat leaves. Comparatively, the joint treatment of 50 mg L-1 Cd2+ and 50 mg L-1 CDs significantly recovered the above parameters. Regarding the synthesis of glutathione (an antioxidant), 50 mg L-1 Cd2+ decreased the expression of related genes (ATPS) by 36.9 +/- 4.4% and indirectly enhanced the expression of APR, SiR, CS and GS. In contrast, in the treatment with both Cd2+ and CDs (50 and 75 mg L-1), the expression of ATPS was higher and the expressions of APR and SiR genes were lower than those in the group of 50 mg L-1 Cd2+ alone. This finding confirms that CDs can alleviate the abiotic stress induced by Cd2+ to plants and lays the foundation for its application in environmental protection and agricultural production.

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