The Isolation and Identification of an Arctic Microalgae and Its Physiological and Biochemical Responses to Enhanced UV-B Radiation

The response of a microalgae(Chlorella sp.)strain which isolation and purification from Arctic glacial meltwater to the enhancement of UV-B radiation was explored in this study.The effects of three different UV-B radiation,i.e.,22 μW/cm2,45 μW/cm2,70 μW/cm2 were tested on the algal growth,biochemical components,and cell ultrastructure.The results showed that UV-B irradiation could inhibit the relative growth and reduce content of pigment;and the inhibiting effects were more significant according to the intensity increasing.Meanwhile,the SOD activity and MDA contents of the strain increased with higher UV-B irradiation.The results showed that the enhancement of UV irradiation could deepen the damage of Chlorella species and algae could adapt the higher intensity of UV-B radiation to some extent.