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Effect of silicon on grain yield of rice under cadmium-stress

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Abstract

Many publications indicated various beneficial effects of the addition of silicon (Si) in soil on the physiology of rice plants. The gene responsible for the Si-uptake in rice, low Si-influx 1 (Lsi1), was identified and cloned for this study. The photosynthetic rate (Pn), grain yield, and resistance to Cadmium (Cd)-stress of the wild-type (WT) and Lsi1-transgenic Lemont rice lines under Cd-stress were examined in an attempt to better understand the mechanism associated with the Si-addition, Cd-stress, and rice physiology. Si-fertilization significantly reduced the Cd-content in rice under Cd-stress. The effect was most significant in the Lsi1-overexpression transgenic Lemont rice (Lsi1-OE line) under high Cd-stress. Conversely, Cd in soil lowered the Si-uptake of the plants indicating a significant interaction between the two elements. During the grain-filling period, Cd-stress greatly reduced the chlorophyll content and Pn of the rice resulting in a diminished grain output. However, Lsi1-OE line with a higher chlorophyll content and Pn than either WT or Lsi1-RNAi transgenic Lemont rice (Lsi1-RNAi line) maintained a high photo-assimilate transportation for high yield potential. At harvest, Lsi1-OE line contained more Si and less Cd than WT, whereas the Lsi1-RNAi line showed an opposite result. In general, Cd-stress reduced, while Si-fertilization significantly increased, the grain yield on rice. However, no significant difference on the grain yields existed between WT and Lsi1-RNAi line. This might be due to a compensation effect generated by Lsi1-RNAi line. It appeared that Si in the soil, as well as the enhancing or inhibiting Lsi1 expression and the resistance to Cd-toxicity of the plants, could significantly affect the rice yield making alternations on these factors a plausible approach for production improvement.

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Abbreviations

Si:

Silicon

Cd:

Cadmium

Lsi1 :

Low Si-influx 1

WT:

Wild type

Lsi1-OE line:

Lsi1-overexpression transgenic Lemont rice

Lsi1-RNAi line:

Lsi1-RNAi transgenic Lemont rice

Pn:

Photosynthetic rate

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 31271670, 31300336), the National Research Foundation for the Doctoral Program of Higher Education of China (No. 20133515130001) and Fujian-Taiwan Joint Innovative Center for germplasm resource and cultivation of crop (Fujian 2011 Program, 2015, 75).

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Authors and Affiliations

  1. Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, People’s Republic of China

    Hongmei Lin, Changxun Fang, Yingzhe Li, Weiwei Lin, Ruiyu Lin & Wenxiong Lin

  2. Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Crop Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, People’s Republic of China

    Jianyu He

  3. Key Laboratory of Crop Ecology and Molecular Physiology of Fujian Universities, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, People’s Republic of China

    Hongmei Lin, Changxun Fang, Yingzhe Li, Weiwei Lin, Jianyu He, Ruiyu Lin & Wenxiong Lin

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  1. Hongmei Lin
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  2. Changxun Fang
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  4. Weiwei Lin
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Correspondence to Ruiyu Lin or Wenxiong Lin.

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Communicated by S. Srivastava.

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Lin, H., Fang, C., Li, Y. et al. Effect of silicon on grain yield of rice under cadmium-stress. Acta Physiol Plant 38, 186 (2016). https://doi.org/10.1007/s11738-016-2177-8

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  • DOI: https://doi.org/10.1007/s11738-016-2177-8

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