Acta Physiologiae Plantarum

, Volume 33, Issue 3, pp 675–682 | Cite as

Silicon enhances photochemical efficiency and adjusts mineral nutrient absorption in Magnaporthe oryzae infected rice plants

  • Dan Gao
  • Kunzheng Cai
  • Jining Chen
  • Shiming Luo
  • Rensen Zeng
  • Jianyuan Yang
  • Xiaoyuan Zhu
Original Paper

Abstract

Silicon (Si) has been verified to play an important role in enhancing plant resistance against pathogens, but the exact mechanisms remain unclear. Two near-isogenic lines of rice (Oryza sativa L.), CO39 (blast susceptible), and C101LAC (Pi-1) (blast resistant), were hydroponically grown to study the effects of exogenous silicon application on the changes of disease incidence, mineral nutrient concentrations, chlorophyll content, and photochemical efficiency in Magnaporthe oryzae infected rice plants. Si amendment in nutrient solution at a concentration of 2.0 mM significantly reduced the disease index of rice plants of CO39 and C101LAC (Pi-1). Silicon application alone had no effects on mineral nutrient contents, chlorophyll content, maximum/potential quantum efficiency (Fv/Fm), and the maximum primary yield (Fv/F0) of photochemistry of PS II in healthy rice leaves. M. oryzae inoculation significantly increased the content of K, Na, Ca, Mg, Fe, and reduced the value of Fv/F0 and Fv/Fm in rice leaves. However, Si treatment suppressed M. oryzae induced increase of mineral nutrient contents, and significantly increased Fv/F0 and Fv/Fm value compared with Si-deficient infected plants. These results suggest that silicon-enhanced resistance to rice blast is associated with an enhancement of photochemical efficiency and adjustment of mineral nutrient absorption in M. oryzae-infected rice plants.

Keywords

Rice Blast Silicon Magnaporthe oryzae Mineral nutrient contents Chlorophyll fluorescence 

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Copyright information

© Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków 2010

Authors and Affiliations

  • Dan Gao
    • 1
    • 2
  • Kunzheng Cai
    • 2
  • Jining Chen
    • 2
  • Shiming Luo
    • 2
  • Rensen Zeng
    • 2
  • Jianyuan Yang
    • 3
  • Xiaoyuan Zhu
    • 3
  1. 1.College of Resources and Environmental SciencesChina Agricultural UniversityBeijingChina
  2. 2.Key Laboratory of Ecological Agriculture of Ministry of AgricultureSouth China Agricultural UniversityGuangzhouChina
  3. 3.Institute of Plant Protection, Guangdong Academy of Agricultural SciencesGuangzhouChina

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