4种南极冰藻的生化组成对UV - B辐射增强的响应

实验室人工模拟南极UV—B辐射环境，对南极冰藻的生化组成变化进行了测定和分析，结果表明．UV—B辐射增强(70μW／cm^2)后，4种南极冰藻的总蛋白含量显著减少，其中脯氨酸、羟脯氨酸等6种氨基酸增加，谷氨酸、缬氨酸等减少；总脂含量明显增加，绿藻增加30％以上，硅藻增加超过15％；饱和脂肪酸含量降低，不饱和脂肪酸含量增加，并且产生了一些新的不饱和脂肪酸；Mg、Na和Al元素的含量显著降低，而Fe、Ca、Zn、Mn等含量却明显增加。总体来说，4种南极冰藻的灰分含量显著下降，有机成分明显增加。表明了南极冰藻对UV—B增强的积极响应．能调整自身对强辐射环境的适应性，这为深入研究冰藻对南极强辐射环境的适应性提供了科学依据。

Responses of bio- chemical compositions of four Antarctic ice microalgae to UV- B irradiation enhancement

UV-B irradiation environment in the Antarctic was setup to simulate in lab. changes in biochemical compositions in four algae. The results showed that after the treatment the contents of protein in four Antarctic ice microalga decreased obviously, and the compositions and contents of amino acids consisting of the protein also changed distinctly. Six amino acids, such as Pro and Pro-OH, increased markedly; seven amino acids, such as Glu and Val, decreased obviously. The contents of the total lipid of four Antarctic ice microalga increased obviously. Total lipid contents of two green algae increase by 30% percent, while two diatoms increase by 15%. Moreover, the contents of the unsaturated fatty acids increased while that of saturated fatty acids decreased, and some new compositions were synthesized in four algae. The elemental contents of Mg,Na and Al decreased while that of Fe,Ca,Zn and Mn increased. In all, the content of inorganic compositions decreased, but that of organic compositions increased. The results that main bio-chemical compositions in four algae changed markedly with UV-B enhancement showed that the Antarctic ice microalga responded to the enhancement of UV-B irradiation actively, and adapted themselves to the strong irradiation environment. Further study needs for be dene on the adaptation of Antarctic ice microalga to the strong UV-B irradiation environment in Antarctic area.