EFFECTS OF LIQUOR CULTURED HYDRODICTYON RETICULATUM ON PHYSIOLOGICAL CHARACTERISTICS OF MICROCYSTIS AERUGINOSA

The mechanism of inhibitory effects of liquor cultured Hydrodictyon reticulatum (LCH) on the growth of Microcystis aeruginosa was studied in present study. The results showed that the growth of M. aeruginosa was inhibited by the LCH markedly, with the highest suppression ratio of 93% at 20% concentration of LCH. The high concentration of the LCH had caused decreased contents of chlorophyll a of M. aeruginosa, increased EC and OD260 value of algal extracellular fluid, increased contents of O-2(-) and MDA as well as SOD activities of M. aeruginosa, indicating that liquor cultured H. reticulatum hindered generation of chlorophyll a and caused damage to photosynthesis. Meanwhile, it induced algal cells to generate plenty of O-2(-) ,which caused lipid peroxidation and damaged the cellular membrane structure when it exceeded the clearance ability of SOD. The main product of lipid peroxidation, MDA, also had altered the membrane permeability and caused intracellular compounds (cytoplasm, nucleic acid, et al) being released, resulted in the disintegration of M. aeruginosa.