Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (12): 2510-2519.doi: 10.3864/j.issn.0578-1752.2012.12.021

• RESEARCH NOTES • Previous Articles     Next Articles

Effects of Silicon on the Physiological and Biochemical Characteristics of Roots of Rice Seedlings Under Water Stress

 MING  Dong-Feng, YUAN  Hong-Mei, WANG  Yu-Hai, GONG  Hai-Jun, ZHOU  Wei-Jun   

  1. 1.浙江大学农业与生物技术学院，杭州 310058
    2.枣庄学院生命科学学院，山东枣庄 277160
    3.枣庄学院化学化工与材料科学学院，山东枣庄 277160
    4.西北农林科技大学园艺学院，陕西杨凌 712100
  • Received:2011-02-20 Online:2012-06-15 Published:2012-03-26

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Abstract: 【Objective】 In order to clarify the mechanism of silicon (Si) in enhancing the resistance to water stress, the effects of Si on the physiological and biochemical characteristics of the roots of rice seedlings were investigated under water stress. 【Method】 The effects of exogenous Si on the physiological and biochemical parameters of roots of rice [(Oryza sativa ssp. (keng) Ting cv. Xiushui 11) and Brazilian upland rice (O. sativa cv. IAPAR 9)] were investigated under water stress induced by polyethylene glycol (PEG) in hydroponic conditions. 【Result】 Exogenous Si could restrain excessive respiration, and increase the dry matter weight and relative water content of the PEG-stressed rice roots. On the 8th day after PEG treatment, the malondialdehyde (MDA) content in the roots of both Si-treated rice cultivars was decreased by 23% and 21%, and the relative electrolyte leakage was decreased by 39% and 38%, respectively, as compared to those of PEG treatment only. Consequently, the plasma membrane stability of the stressed roots was enhanced by Si application. In addition, exogenous Si also increased the root antioxidant defense capacity, slowed down the degradation of abscisic acid (ABA) in rice roots under PEG stress. 【Conclusion】 Silicon application could enhance the resistance of rice roots to water deficit stress by preventing the rapid decline of physiological and biochemical activities in roots.

Key words: rice, silicon, water stress, root

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