鱼腥藻7120响应NaCl胁迫的光合特性  

CHANGES IN PHOTOSYNTHETIC PROPERTIES OF A FILAMENTOUS CYANOBACTERIUM ANABAENA SP.PCC 7120 IN RESPONSE TO NaCl STRESS

作　　者：欧阳叶新[1] 施定基[2] 黄开耀[3] 梁承邺[4] 胡鸿钧[1] 

机构地区：[1]中国科学院武汉植物研究所,武汉430074 [2]中国科学院植物研究所,北京100093 [3]武汉大学生命科学院遗传系,武汉430072 [4]中国科学院华南植物研究所,广州510650

出　　处：《水生生物学报》2003年第1期74-77,共4页Acta Hydrobiologica Sinica

基　　金：国家科技部海洋 86 3项目资助 (课题编号 :819- 0 4- 11)

摘　　要：NaCl胁迫处理丝状蓝藻鱼腥藻 712 0后光合特性的变化表明 :鱼腥藻 712 0的净光合放氧速率和呼吸速率随NaCl浓度的升高而降低 ,且浓度低于 0 .4mol/LNaCl时的降幅比高于 0 .4mol/LNaCl时的降幅小。加入 0 .4% (W /V)的蔗糖后可提高盐胁迫后的鱼腥藻 712 0的光合放氧速率。吸收光谱测定结果表明盐胁迫没有改变鱼腥藻 712 0的光合色素组成 ,但导致藻胆蛋白的总含量降低、类胡萝卜素含量增加。低温荧光发射光谱测定表明盐胁迫后改变了光能在两个光系统之间的分配 ,由藻胆蛋白吸收的光能向光系统Ⅱ传递受阻。荧光动力学分析表明光系统Ⅱ的光化学效率随盐浓度的增加而降低 ,表现出与光合放氧速率的一致性。The changes in photosynthetic properties of filamentous cyanobacterium Anabaena sp.PCC 7120(A. 7120) in response to NaCl stress had been studied.It showed that both the net photosynthetic oxygen evolution rates and respiration rates were decreased more quickly with increasing NaCl concentrations when NaCl concentrations exceed 0.4 mol/L were. The absorption spectra had been shown that the photosynthetic pigments of A. 7120 under NaCl stress were unchanged,but the total contents of phycobiliproteins decreased and those of carotenoids increased.The low temperature fluoresence emission spectra suggested that the energy transfer from phycobiliprotein to photosystem I in A.7120 under NaCl stress was depressed.And the chlorophyll a fluoresence induction kinetics analysis displayed that changes in Fv/Fm ratios of A.7120 was consistent with those of the net photosynthetic oxygen evolution rates in response to NaCl stress.

关 键 词：盐胁迫 鱼腥藻7120 响应 NACL胁迫 光合特性 

分 类 号：Q945.78[生物学—植物学] Q949.2