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Citation:

Physiological and Biochemical Responses of Thuja sutchuenensis and Platycladus orientalis Seedlings to Natural Cooling

  • Received Date: 2012-07-17
  • The paper focused on two species seedlings, Thuja sutchuenensis and Platycladus orientalis. Their adaptability to low temperature stress was compared by detecting and analyzing the leaves variable characteristics of antioxidant enzymes, osmotic adaptive substances and malondialdehyde (MDA) in the process of seasonal cooling in autumn and winter. The results showed that: during the process of seasonal cooling, the daily minimum air temperature decreased from 12.5℃ to -13.96℃, the superoxide dismutase (SOD) activity of T. sutchuenensis was strengthened significantly, however, the change of Peroxidase (POD) activity was not obvious, and both SOD and POD activities of P. orientalis were strengthened. The content of proline (Pro) and soluble sugars in leaves increased significantly in two species, T. sutchuenensis was lower than P. orientalis. The MDA content in leaves of the two species increased significantly, while T. sutchuenensis increased more than P. orientalis. The daily minimum air temperature was significantly correlated with the SOD, POD activity and soluble sugar content in P. orientalis, but it just correlated with the SOD activity in T. sutchuenensis. All these suggest that, during seasonal cooling, P. orientalis is more adaptive to low temperature stress than T. sutchuenensis through establishing better defensive system and conducting self-adjustment. The results of the research can provide reference for the T. sutchuenensis ex-situ conservation and cultivation management.
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Physiological and Biochemical Responses of Thuja sutchuenensis and Platycladus orientalis Seedlings to Natural Cooling

  • 1. College of Agriculture, He’nan University of Science and Technology, Luoyang 471003, He’nan, China
  • 2. Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Key Laboratory of Forest and Environment of State Forestry Administration, Beijing 100091, China
  • 3. Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
  • 4. Forest Bureau of Kaixian County, Kaixian 404500, Chongqing, China

Abstract: The paper focused on two species seedlings, Thuja sutchuenensis and Platycladus orientalis. Their adaptability to low temperature stress was compared by detecting and analyzing the leaves variable characteristics of antioxidant enzymes, osmotic adaptive substances and malondialdehyde (MDA) in the process of seasonal cooling in autumn and winter. The results showed that: during the process of seasonal cooling, the daily minimum air temperature decreased from 12.5℃ to -13.96℃, the superoxide dismutase (SOD) activity of T. sutchuenensis was strengthened significantly, however, the change of Peroxidase (POD) activity was not obvious, and both SOD and POD activities of P. orientalis were strengthened. The content of proline (Pro) and soluble sugars in leaves increased significantly in two species, T. sutchuenensis was lower than P. orientalis. The MDA content in leaves of the two species increased significantly, while T. sutchuenensis increased more than P. orientalis. The daily minimum air temperature was significantly correlated with the SOD, POD activity and soluble sugar content in P. orientalis, but it just correlated with the SOD activity in T. sutchuenensis. All these suggest that, during seasonal cooling, P. orientalis is more adaptive to low temperature stress than T. sutchuenensis through establishing better defensive system and conducting self-adjustment. The results of the research can provide reference for the T. sutchuenensis ex-situ conservation and cultivation management.

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