Biological Trace Element Research

, Volume 142, Issue 1, pp 67–76

Silicon Alleviates Drought Stress of Rice Plants by Improving Plant Water Status, Photosynthesis and Mineral Nutrient Absorption

Article

DOI: 10.1007/s12011-010-8742-x

Cite this article as:
Chen, W., Yao, X., Cai, K. et al. Biol Trace Elem Res (2011) 142: 67. doi:10.1007/s12011-010-8742-x

Abstract

Drought is a major constraint for rice production in the rainfed lowlands in China. Silicon (Si) has been verified to play an important role in enhancing plant resistance to environmental stress. Two near-isogenic lines of rice (Oryza sativa L.), w-14 (drought susceptible) and w-20 (drought resistant), were selected to study the effects of exogenous Si application on the physiological traits and nutritional status of rice under drought stress. In wet conditions, Si supply had no effects on growth and physiological parameters of rice plants. Drought stress was found to reduce dry weight, root traits, water potential, photosynthetic parameters, basal quantum yield (Fv/F0), and maximum quantum efficiency of PSII photochemistry (Fv/Fm) in rice plants, while Si application significantly increased photosynthetic rate (Pr), transpiration rate (Tr), Fv/F0, and Fv/Fm of rice plants under drought stress. In addition, water stress increased K, Na, Ca, Mg, Fe content of rice plants, but Si treatment significantly reduced these nutrient level. These results suggested that silicon application was useful to increase drought resistance of rice through the enhancement of photochemical efficiency and adjustment of the mineral nutrient absorption in rice plants.

Keywords

Rice Silicon Drought Photosynthesis Root activity Mineral nutrient 

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Wei Chen
    • 1
  • Xiaoqin Yao
    • 1
    • 2
  • Kunzheng Cai
    • 1
  • Jining Chen
    • 1
  1. 1.Key Laboratory of Ecological Agriculture of Ministry of AgricultureSouth China Agricultural UniversityGuangzhouChina
  2. 2.The College of Life SciencesHebei UniversityBaodingChina

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