阳光紫外辐射和盐胁迫对钝顶螺旋藻光合作用和形态变化的耦合效应

将钝顶螺旋藻培养在含有不同NaCl浓度（0、0．4、0．8mol·L^-1）的培养基中，并置于室外全波段太阳辐射、阳光辐射滤除uvB以及光合有效辐射（PAR）三种辐射条件下，以探讨阳光uV辐射和盐胁迫对钝顶螺旋藻的耦合效应。结果表明，阳光uv辐射显著抑制钝顶螺旋藻的光化学效率，且随着盐浓度的提高，其受抑制程度加剧。D1蛋白含量在高水平PAR和uV辐射下都明显降低，而高盐浓度（0．8mol·L^-1NaCl）导致其含量进一步下降。此外，阳光uv辐射与盐胁迫的耦合作用使得藻丝发生明显断裂。

Combined Effects of Solar Ultraviolet Radiation and Salt Stress on Photosynthesis and Morphology of Arthrospira(Spirulina) platensis

Arthrospira （Spirulina） platensis （Cyanophyta） cultured with different NaC1 concentrations （0, 0.4, 0.8 mol＇L-1） were exposed to full spectrum of solar radiation, solar radiation depleted of UV-B, and photosynthetically active radiation （PAR） in order to investigate the combined effects of solar UV radiation and salt stress on A. platensis. It showed that the photochemical efficiency ofA. platensis was significantly decreased by solar UV radiation, and this inhibitory effect was accelerated with the increase of salt concentration. Both high level of PAR and UV radiation reduced the D1 protein content, and high concentration （0.8 mol.L^-1） of NaC1 resulted in a further decline of D 1 protein. In addition, the combined effects of solar UV radiation and salt stress led to serious breakage of the spiral structure ofA. platensis.