Changes in the Growth, Physiology and Biochemistry of <i>Alexandrium tamarense</i> under <i>Ulva pertusa</i> Kjellman Stress and UV-B Radiation

Abstract

Effects of Ulva pertusa Kjellman stress and UV-B radiation on the growth, physiology and biochemistry of Alexandrium tamarense were studied under laboratory conditions. The results demonstrated that U. pertusa stress and UV-B radiation could inhibit the growth of A. tamarense. Physiology and biochemistry of A. tamarense could be affected under U. pertusa stress and UV-B radiation treatment. U. pertusa stress caused the increase in SOD activity and decrease in H2O2 content. As for UV-B radiation, Chl-a content and soluble content were decreased, while H2O2 content, MDA content and SOD activity were increased. With regard to the combined effects of U. pertusa stress and UV-B radiation, Chl-a content and soluble content were decreased, while MDA content and SOD activity were increased. Compared with UV-B radiation, the combined effects of U. pertusa stress and UV-B radiation treatment on the growth, physiological and biochemical were indiscernible.