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《Advances in Marine Science》 2004-03
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Response of Antioxidase Activity in Antarctic Ice Microalgae Chlorophyceae L-4 to UV-B Radiation Enhancement

MIAO Jin-lai~(1,2),WANG Bo~(3),KAN Guang-feng~3,JIANG Ying-hui~3,HOU Xu-guang~4,LI Guang-you~(1,2) (1.First Institute of Oceanography,SOA, Qingdao 266061,China; 2. 3. College of Marine Life, Ocean University of China,Qingdao 266003,China; 4. College of Life Science, Shandong University, Ji′nan 250100,China)  
In order to understand the active oxygen free radical clearing function of protecting enzymes in antarctic ice mircoralgae Chlorophyceae L-4 at diferent UV-B radiation intensities, the malonaldehyde(MAD) content changes, the free radical generation rate and the corresponding protecting enzyme changes in Chlorophyceae L-4 at Different UV-B radiation intensities were determined. It is shown from the determined results that the MAD content in Chlorophyceae L-4 increased rapidly in early days (1 to 3 days) of UV-B radiation enhancement, then decreased rapidly, and the protecting enzyme activity could return to fundamental level at low UV-B radiation intensity (35μm·cm~(-2)). Under the stress of UV-B radiation enhancement, the superoxide dismutase(SOD), peroxidase (POD) and catalase (CAT) activities in Chlorophyceae L-4 were obviously higher than those in the control, and their activities became higher at high UV-B radiation intensity (70μm·cm~(-2)). The ascorbic acid peroxidase (APX) activity in Chlorophyceae L-4 increased slightly or kept stable under the stress of UV-B radiation enhancement. The above experimental results indicate that the protecting enzyme system plays an important role in the adaptation of antarctic ice microalgae to the strong antarctic radiation environment.
【Fund】: 国家自然科学基金资助项目——南极冰藻中抗紫外辐射活性物质的研究(40206022)
【CateGory Index】: Q947
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