Effects of coexisting bacteria on the growth of Microcystis aeruginosa under different carbon sources
Microcystis aeruginosa can utilize the inorganic carbon in water environment for photosyn-thesis and carbon fixation through carbon concentrating mechanism(CCM)to promote its growth,which is the dominant species that causes freshwater cyanobacteria bloom.The algal-bacterial symbio-sis system is an important part of natural water systems,which plays an important role in regulating algal blooms,while the system under different carbon source combinations adds many unknowns to the growth and reproduction of algae.In this paper,Microcystis aeruginosa was selected as the re-search object to explore the effects of exogenous carbon source on the growth of Microcystis aerugino-sa under different initial ratios of bacteria to algae.When the concentration of the total carbon(TC)was 25 mg/L,the combination of inorganic carbon source and organic carbon source was added,and the initial ratio of bacteria to algae in the environment was 1∶2,the predicted maximum biomass of Microcystis aeruginosa in the culture cycle reached 5.0×107 cell/mL,which was 2.05 times higher than that of the pure algae control group.When 25 mg/L organic carbon source was added and the ini-tial ratio of bacteria to algae was 5∶1,the predicted maximum biomass in the culture cycle reached the minimum,which was 1.5×107 cell/mL,which was only 0.76 times that of the pure algae control group.The results showed that the addition of initial bacteria under different carbon sources would greatly affect the growth of Microcystis aeruginosa.Among them,under the nutritional conditions of inorganic carbon source and mixed carbon source,the addition of initial bacteria would greatly acceler-ate the growth and reproduction of Microcystis aeruginosa.
carbon sourcecoexisting bacteriamicroalgae growthratio of bacteria to algae
NETL
NSTL
万方数据
维普
