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The adaptability of three Arctic microalgae to different low temperatures

【标题】The adaptability of three Arctic microalgae to different low temperatures

【Title】The adaptability of three Arctic microalgae to different low temperatures

【作者】 夏利花; 何剑锋; 张芳; 高岩; 张汝民; 崔世开

【Author】

【期刊】极地研究

【Journal】

【期刊年份】2010

【卷】Vol. 21

【期】

【关键词】 Arctic microalga; adaptability; MDA; SOD; CAT

【Keywords】 Arctic microalga; adaptability; MDA; SOD; CAT

【摘要】In order to study the adaptability of Arctic microalgae to different environmental temperatures, the growth curves and antioxidase system of three microalgae ( Skeletonema marinoi , Chlorella  sp. and Chlamydomonas sp.) that were separated from the Ny-Ålesund, the high Arctic, at different low temperatures (0℃, 4℃ and 8℃) were determined. The result showed that the adaptability of the microalgae to temperatures depended on the species. The growth rate, SOD and CAT activities of Skeletonema marinoi were the highest at 4℃, but MDA content was the lowest. The growth rate and enzyme activity of Chlorella sp. were the highest at 8℃, while the lowest MDA content presented at 0℃. The growth of Chlamydomonas sp. at the different temperatures was not so significant, the lowest MDA content presented at 8℃. The change of antioxidase system also depended on species and temperatures. Three indexes of antioxidase system of Skeletonema marinoi between 0℃ and 4℃ showed extremely significant difference (p<0.01). SOD activity of Skeletonema marinoi and Chlorella sp.between 0℃ and 8℃ showed significant difference (p<0.05), and the other two indexes of them differed insignificantly. Antioxidase systems of Chlamydomonas sp. at the three temperatures differed insignificantly. In conclusion, the three microalgae had good adaptability to the three temperatures; their MDA content presented a low level, and had unique physiological mechanism to adapt to the environment with different low temperatures.

【Abstract】In order to study the adaptability of Arctic microalgae to different environmental temperatures, the growth curves and antioxidase system of three microalgae ( Skeletonema marinoi , Chlorella  sp. and Chlamydomonas sp.) that were separated from the Ny-Ålesund, the high Arctic, at different low temperatures (0℃, 4℃ and 8℃) were determined. The result showed that the adaptability of the microalgae to temperatures depended on the species. The growth rate, SOD and CAT activities of Skeletonema marinoi were the highest at 4℃, but MDA content was the lowest. The growth rate and enzyme activity of Chlorella sp. were the highest at 8℃, while the lowest MDA content presented at 0℃. The growth of Chlamydomonas sp. at the different temperatures was not so significant, the lowest MDA content presented at 8℃. The change of antioxidase system also depended on species and temperatures. Three indexes of antioxidase system of Skeletonema marinoi between 0℃ and 4℃ showed extremely significant difference (p<0.01). SOD activity of Skeletonema marinoi and Chlorella sp.between 0℃ and 8℃ showed significant difference (p<0.05), and the other two indexes of them differed insignificantly. Antioxidase systems of Chlamydomonas sp. at the three temperatures differed insignificantly. In conclusion, the three microalgae had good adaptability to the three temperatures; their MDA content presented a low level, and had unique physiological mechanism to adapt to the environment with different low temperatures.

【基金/项目】 国家自然科学基金 ; 上海市科委国际合作项目 ; 国家海洋局青年海洋科学基金 ; 国家海洋局海洋环境科学和数值模拟重点实验室开放基金 ; 中国极地研究中心极地科学青年创新基金 ; 中国极地科学战略研究基金

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