Plant Biotechnology Reports

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Differential antioxidation activities in two alfalfa cultivars under chilling stress

  • Wang, Wen-Bin (State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University) ;
  • Kim, Yun-Hee (Enviromental Biotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)) ;
  • Lee, Haeng-Soon (Enviromental Biotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)) ;
  • Deng, Xi-Ping (State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University) ;
  • Kwak, Sang-Soo (Enviromental Biotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB))
  • Received : 2009.03.30
  • Accepted : 2009.06.25
  • Published : 2009.10.31
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Abstract

To understand the adaptability of alfalfa (Medicago sativa L.) to chilling stress, we analyzed the antioxidative mechanism during seed germination. The germination rates of six alfalfa cultivars were studied comparatively at $10^{\circ}C$. Xinmu No. 1 and Northstar were selected as chilling stress-tolerant and stress-sensitive cultivars for further characterization. After chilling treatment, Xinmu No. 1 showed higher seedling growth than Northstar. Xinmu No. 1 exhibited low levels of hydrogen peroxide and lipid peroxidation compared with Northstar. In addition, shoots in Xinmu No. 1 treated with chilling showed higher activities of the superoxide dismutase, ascorbate peroxidase (APX), and catalase than those of Northstar, whereas Xinmu No. 1 showed higher APX activity in roots that Northstar. These results indicated that high antioxidation activity in Xinmu No. 1 under chilling stress is well associated with tolerance to chilling condition during germination.

Keywords

Acknowledgement

Supported by : The Korea Foundation for International Cooperation of Science and Technology (KICOS), MEST, KRIBB

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