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Silicon-Mediated Enhancement of Heavy Metal Tolerance in Rice at Different Growth Stages

Author

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  • Fei Huang

    (Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
    Key Laboratory of Tropical Agro-Environment, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, China)

  • Xiao-Hui Wen

    (Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China)

  • Yi-Xia Cai

    (Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
    Key Laboratory of Tropical Agro-Environment, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, China)

  • Kun-Zheng Cai

    (Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
    Key Laboratory of Tropical Agro-Environment, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, China)

Abstract

Silicon (Si) plays important roles in alleviating heavy metal stress in rice plants. Here we investigated the physiological response of rice at different growth stages under the silicon-induced mitigation of cadmium (Cd) and zinc (Zn) toxicity. Si treatment increased the dry weight of shoots and roots and reduced the Cd and Zn concentrations in roots, stems, leaves and grains. Under the stress of exposure to Cd and Zn, photosynthetic parameters including the chlorophyll content and chlorophyll fluorescence decreased, while the membrane permeability and malondialdehyde (MDA) increased. Catalase (CAT) and peroxidase (POD) activities increased under heavy metals stress, but superoxide dismutase (SOD) activities decreased. The magnitude of these Cd- and Zn-induced changes was mitigated by Si-addition at different growth stages. The available Cd concentration increased in the soil but significantly decreased in the shoots, which suggested that Si treatment prevents Cd accumulation through internal mechanisms by limiting Cd 2+ uptake by the roots. Overall, the phenomena of Si-mediated alleviation of Cd and excess Zn toxicity in two rice cultivars could be due to the limitation of metal uptake and transport, resulting in an improvement in cell membrane integrity, photosynthetic performance and anti-oxidative enzyme activities after Si treatment.

Suggested Citation

  • Fei Huang & Xiao-Hui Wen & Yi-Xia Cai & Kun-Zheng Cai, 2018. "Silicon-Mediated Enhancement of Heavy Metal Tolerance in Rice at Different Growth Stages," IJERPH, MDPI, vol. 15(10), pages 1-16, October.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:10:p:2193-:d:174133
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    Citations

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    Cited by:

    1. Zheyong Li & Yajun Yuan & Luojing Xiang & Qu Su & Zhenyan Liu & Wenguang Wu & Yihao Huang & Shuxin Tu, 2022. "Silicon-Rich Biochar Detoxify Multiple Heavy Metals in Wheat by Regulating Oxidative Stress and Subcellular Distribution of Heavy Metal," Sustainability, MDPI, vol. 14(24), pages 1-17, December.
    2. Hongbing Chen & Fangfang Shu & Sheng Yang & Yadong Li & Shilin Wang, 2019. "Competitive Inhibitory Effect of Calcium Polypeptides on Cd Enrichment of Brassia campestris L," IJERPH, MDPI, vol. 16(22), pages 1-18, November.
    3. Lei Shi & Zhaohui Guo & Fang Liang & Xiyuan Xiao & Chi Peng & Peng Zeng & Wenli Feng & Hongzhen Ran, 2019. "Effect of Liming with Various Water Regimes on Both Immobilization of Cadmium and Improvement of Bacterial Communities in Contaminated Paddy: A Field Experiment," IJERPH, MDPI, vol. 16(3), pages 1-14, February.

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