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湖泊科学  2008 

碱度增加对蛋白核小球藻光合活性与胞外多糖的影响

DOI: 10.18307/2008.0218

Keywords: 碱度,光合活性,光合色素,胞外多糖,丙二醛

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Abstract:

本文研究了不同重碳酸盐(HCO3-)碱度2.3mmol/L(ALK2.3)和12.4mmol/L(ALK12.4)条件对蛋白核小球藻光合活性、色素组成、丙二醛(MDA)含量与胞外多糖的影响.实验结果表明,碱度增加对蛋白核小球藻光合活性呈促进-抑制-促进效应,ALK2.3对光合活性影响的强度高于ALK12.4.碱度增加提高叶绿素b/叶绿素a(Chl.b/Chl.a)的值,降低类胡萝卜素/叶绿素(Caro/TChl)的值,并且ALK12.4条件下对藻细胞的作用程度强于ALK2.3.此外碱度增加刺激蛋白核小球藻胞外多糖分泌,ALK2.3在培养初期提高MDA含量,ALK12.4下细胞MDA含量显著降低.说明碱度增加会促进蛋白核小球藻光合活性,促进光合产物的积累与分泌.暗示胞外多糖的分泌可能是细胞适应高碱度的一种自我保护机制.

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