Original Paper

Acta Physiologiae Plantarum

, Volume 33, Issue 3, pp 675-682

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

  • Dan GaoAffiliated withCollege of Resources and Environmental Sciences, China Agricultural UniversityKey Laboratory of Ecological Agriculture of Ministry of Agriculture, South China Agricultural University
  • , Kunzheng CaiAffiliated withKey Laboratory of Ecological Agriculture of Ministry of Agriculture, South China Agricultural University Email author 
  • , Jining ChenAffiliated withKey Laboratory of Ecological Agriculture of Ministry of Agriculture, South China Agricultural University
  • , Shiming LuoAffiliated withKey Laboratory of Ecological Agriculture of Ministry of Agriculture, South China Agricultural University
  • , Rensen ZengAffiliated withKey Laboratory of Ecological Agriculture of Ministry of Agriculture, South China Agricultural University
  • , Jianyuan YangAffiliated withInstitute of Plant Protection, Guangdong Academy of Agricultural Sciences
  • , Xiaoyuan ZhuAffiliated withInstitute of Plant Protection, Guangdong Academy of Agricultural Sciences

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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 (F v/F m), and the maximum primary yield (F v/F 0) 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 F v/F 0 and F v/F m in rice leaves. However, Si treatment suppressed M. oryzae induced increase of mineral nutrient contents, and significantly increased F v/F 0 and F v/F m 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