增强UV-B胁迫对青海湖蓝藻生理代谢的影响

The responds of cyanobacteria in Qinghai Lake to enhanced UV-B radiation

本研究以从青海湖水系中分离纯化获得的蓝藻A作为实验材料,研究了增强UV-B辐射(240μW/cm2)对青海湖蓝藻生物量、叶绿素、类胡萝卜素、蛋白质、MDA和脯氨酸含量的影响.结果表明:增强UV-B辐射使蓝藻A生物量明显减少,叶绿素a和类胡萝卜素含量、蛋白含量均有所上升,MDA及脯氨酸含量出现明显变化说明增强UV-B对青海湖蓝藻的生长、发育和生理代谢产生重要影响,同时由于其长期适应高海拔、高强度UV-B辐射的结果从而产生了一定的响应和适应机制.

We utilize the cyanobacteria A which isolated and purified form Qinghai Lake as experimental material. Study the effects of the short-term intensified UV-B radiation(240μW/cm2) on the content of biomass, chlorophyll, carotenoid, protein, MDA and proline. The results shows that after short-term intensified UV-B radiation the content of biomass was significant declines, the content of chlorophyll、carotenoid and protein was increased, meanwhile the contents of MDA and proline was decreased. Above states the cyanobacteria A in Qinghai Lake has evolved a adaptive mechanism after long-term intensified UV-B radiation, lipid peroxidation was reduced resulting in attenuation of damaging effects of UV-B, and in some degree UV-B radiation promotes the synthesis of photosynthetic pigment and protein.