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Foliar application with nano-silicon reduced cadmium accumulation in grains by inhibiting cadmium translocation in rice plants

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Abstract

Nano-silicon (Si) may be more effective than regular fertilizers in protecting plants from cadmium (Cd) stress. A field experiment was conducted to study the effects of nano-Si on Cd accumulation in grains and other organs of rice plants (Oryza sativa L. cv. Xiangzaoxian 45) grown in Cd-contaminated farmland. Foliar application with 5~25 mM nano-Si at anthesis stage reduced Cd concentrations in grains and rachises at maturity stage by 31.6~64.9 and 36.1~60.8%, respectively. Meanwhile, nano-Si application significantly increased concentrations of potassium (K), magnesium (Mg), and iron (Fe) in grains and rachises, but imposed little effect on concentrations of calcium (Ca), zinc (Zn), and manganese (Mn) in them. Uppermost nodes under panicles displayed much higher Cd concentration (4.50~5.53 mg kg−1) than other aerial organs. After foliar application with nano-Si, translocation factors (TFs) of Cd ions from the uppermost nodes to rachises significantly declined, but TFs of K, Mg, and Fe from the uppermost nodes to rachises increased significantly. High dose of nano-Si (25 mM) was more effective than low dose of nano-Si in reducing TFs of Cd from roots to the uppermost nodes and from the uppermost nodes to rachises. These findings indicate that nano-Si supply reduces Cd accumulation in grains by inhibiting translocation of Cd and, meanwhile, promoting translocation of K, Mg, and Fe from the uppermost nodes to rachises in rice plants.

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Funding

This work has been financed by the Funds for Science and Technology Innovation Project from the Chinese Academy of Agricultural Sciences (grant no. CAAS-XTCX2016018). We are grateful to Dr. Li Mu for providing help in using ICP-MS.

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Author notes

  1. Rui Chen and Changbo Zhang contributed equally to this work.

Authors and Affiliations

  1. Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin, 300191, People’s Republic of China

    Rui Chen, Changbo Zhang, Yanling Zhao, Yongchun Huang & Zhongqi Liu

Authors
  1. Rui Chen
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  2. Changbo Zhang
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  3. Yanling Zhao
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  4. Yongchun Huang
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  5. Zhongqi Liu
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Correspondence to Zhongqi Liu.

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Responsible editor: Philippe Garrigues

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Chen, R., Zhang, C., Zhao, Y. et al. Foliar application with nano-silicon reduced cadmium accumulation in grains by inhibiting cadmium translocation in rice plants. Environ Sci Pollut Res 25, 2361–2368 (2018). https://doi.org/10.1007/s11356-017-0681-z

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