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Acta Agron Sin ›› 2011, Vol. 37 ›› Issue (05): 876-881.doi: 10.3724/SP.J.1006.2011.00876

• TILLAGE & CULTIVATION · PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Response of Gas Exchange, Chlorophyll a Fluorescence and Anti-oxidation Enzymes Activities to Osmotic Stress in an Upland Rice Progeny YF2-1 Derived from Oryza sativa × Echinochloa caudata

DING Zai-Song1,WANG Chun-Yan2,GUAN Dong-Ming2,ZHAO Feng-Wu3,ZHAO Ming1,*   

  1. 1 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences / Key Laboratory of Crop Physiology and Production, Ministry of Agriculture, Beijing 100081, China; 2 Chemistry and Environment Engineering College, China University of Mining & Technology, Beijing 100083, China; 3 Dry Land Farming Institute, Hebei Academy of Agriculture and Forestry Sciences, Hengshui 053000, China
  • Received:2010-10-09 Revised:2011-03-08 Online:2011-05-12 Published:2011-03-24

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Abstract: Wild species generally have higher stress resistance than cultivated crops and are utilized as the sources of stress resistance genes in stress resistance improvement of crops. In rice, its wild relatives have been used to improve photosynthesis, yield and stress resistance. YF2-1 is obtained by distant cross between Oryza sativa and Echinochloa caudate. In order to assess its osmotic stress resistance on physiological level, gas exchange, chlorophyll a fluorescence and antioxidation enzyme activities under osmotic stress simulated by PEG-6000 were studied in seedlings of upland rice YF2-1 and H65.The results showed that YF2-1 maintained higher net photosynthetic rate and stomatal conductance under osmotic stress condition, indicating YF2-1 suffered less inhibition in photosynthesis. This may be related to its higher water retaining capacity and its effective functions for high excessive light energy dispersing (higher NPQ) and higher activities of anti-oxidation enzymes SOD, POD, and CAT, effectively clearing AOS produced by excessive light energy. The result shows that the distant crossing may increase the resistance to osmotic stress in rice.

Key words: Upland rice, Distant crossing, Photosynthetic characteristics, Osmotic stress

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