Algae-lysing Effect of Algicidal Bacterium Serratia sp.on Microcystis aeruginosa and Scenedesmus obliquus
[Objective]The aim of this paper is to investigate the algae-lysing effect of an algaolytic bacterium S6(Serratia sp.)on dominant cyanobacteria and green algae in eutrophic water.[Method]The algaolytic bacterium S6(Serratia sp.,accession No.KY462187)was isolated from the eutrophic water;the bacterium at different concentrations was added to the algal solutions of Microcystis aeruginosa,Scenedesmus obliquus,and a mixture of the two in the ratios of 1∶1(Hereinafter referred to as"mixed algae").The algal biomass,concentration of chlorophyll a,NH3-N and TP of the experimental systems were measured,and the algae-lysing effect on different algae and effect on nitrogen and phosphorus of the experimental systems were analyzed in a fortnight.Then,algae-lysing products were analyzed by spectral technology of these experimental systems.[Result and Conclusion]The strain S6 had a desirable algae-lysing effect on M.aeruginosa and S.obliquus under monoculture and coculture,the higher the concentrations of bacterium,the better the algae-lysing effect,dissolving M.aeruginosa,S.obliquus and the mixed algae under coculture with a removal rate of 89.4%,80%and 78.6%in the three original bacterial suspensions.Furthermore,the concentrations of NH3-N and total phosphorus(TP)of the three experimental systems existed fluctuations significantly,those of the M.aeruginosa decreased by 21.24 and 6.21 mg/L,those of the S.obliquus decreased by 13.19 and 7.54 mg/L,those of the mixed algae decreased by 10.81 and 11.85 mg/L.The algae-lysing products of the three experimental systems were analyzed by infrared spectroscopy,ultraviolet spectroscopy and three-dimensional fluorescence spectroscopy scanning,and it was found that the algae-lysing products of M.aeruginosa mainly contained tryptophan-like,fulvic acid-like and humic acid-like substances,while the algae-lysing products of S.obliquus mainly contained tryptophan-like and humic acid-like substances.
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