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Seasonal changes of leaf anti-oxidative system in Sabina and their relations to freezing tolerance

CHEN Yinping1,2; ZHANG Manxiao3; CHEN Tuo4; ZHANG Youfu4;AN Lizhe2,4   

  1. 1School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
    2School of Life Science, Lanzhou University, Lanzhou 730000, China;
    3Lanzhou College of Petrochemical Technology , Lanzhou 730060, China;
    4Cold and Arid Region Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China

  • Received:2005-12-12 Revised:2006-07-28 Online:2006-11-10 Published:2006-11-10

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Abstract: This paper studied the seasonal changes of leaf anti-oxidative system in evergreen woody plants Sabina przewalskii and S. chinensis during their adaptation process of freezing. The results showed that the freezing tolerance of Sabina was correlated with its leaf anti-oxidative system whichcould scavenge or detoxify reactive oxygen species (ROS), inhibit membrane lipid peroxidation, and maintain membrane integrality in time. The ROS accumulated in the process of cold acclimation might induce the leaf to acquire freezing tolerance through its anti-oxidative system. The better capability of anti-oxidative system in S. przewalskii might account for its greater freezing tolerance than S. chinensis.

Key words: East China Sea, Harmful alga bloom, Prorocentrum dentatum