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为了研究北极微藻对不同环境温度的适应性,对分离自北极王湾地区的三种微藻-玛氏骨条藻(Skeletonema marinoi)、小球藻(Chlorella sp.)和衣藻(Chlamydomonas sp.)在不同温度条件下(0℃、4℃和8℃)的生长曲线和抗氧化酶系统进行了测定.结果表明微藻对温度的适应性因种而异:玛氏骨条藻在4℃具有最快生长速率,最高的超氧化物歧化酶(SOD)和过氧化氢酶(CAT)酶活性,及最低的丙二醛(MDA)含量;小球藻的最快生长速率及酶活均在8℃时,MDA含量最低值出现在0℃;衣藻生长情况相差不大,MDA含量的最低值出现在8℃.抗氧化酶系统变化规律也因藻种及温度而异--在0℃与4℃变化时,玛氏骨条藻抗氧化酶系统的三个指标的差异极显著(P<0.01);在0℃与8℃变化时,玛氏骨条藻与小球藻的SOD活性的差异显著(P<0.05),其余两个指标差异不显著;衣藻在三个温度下的三个指标差异均不显著.总体而言,三种藻对三个温度的适应性均较好:其MDA的含量均较低,三种藻各自具有独特的生理代谢机制来适应不同的温度环境. 相似文献
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In order to study the adaptability of Arctic mieroalgae to different environmental temperatures, the growth curves and antioxidase system of three microalgae ( Skeletonema marinoi, Chlorella sp. and Chlam ydomonas sp. ) that were separated from the Ny-Alesund, 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. 相似文献
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