Ecological Effect of Z-QS01 Strain on Chlorella vulgaris and Its Response to UV-B Radiation Stress

An associated heterotrophic dominant single bacteria-Z-QS01 was selected to study its mechanism of quorum sensing and factors that affected quorum sensing by using ecotoxicological method in co-cultural system with Chlorella vulgaris. The results showed that self-regulation and inhibitive effect to Chlorella vulgaris of bacteria-Z-QS01 were conducted through excreting chemic substance. Density of bacteria-Z-QS01 and concentration of chemic substance excreted by bacteria-Z-QS01 were necessary conditions, which decided whether the regulation mechanism could be carried out or not; enhanced UV-B radiation could affect quorum sensing of bacteria-Z-QS01 significantly, and the inhibitition effect was enhanced gradually with the dose of UV-B radiation increasing.