Effects of artificial turbulence on physiology and biochemistry of Microcystis aeruginosa
To explore the mechanism underlying the impact of water disturbance on algal growth and physiology,the growth metabolism and photosynthesis of Microcystis aeruginosa cells were examined under controlled artificial turbulence.The results demonstrated that the uptake of nitrogen and phosphorus by Microcystis aeruginosa cells could be enhanced by the moderate disturbance,consequently stimulating algal growth.Conversely,the growth of algae was inhibited by excessive disturbance.Furthermore,an increase in the photosynthetic activity and rate,as well as the production of adenosine triphosphate(ATP)in algal cells,was observed under moderate disturbance.At 14days of the trial,the effective quantum yield(Y(Ⅱ))of photosystem Ⅱ(PS Ⅱ)in the 400r/min disturbance group was 3.77times higher than that before the disturbance.At 500r/min,enhanced antioxidant enzyme activity was exhibited by Microcystis aeruginosa cells to mitigate the oxidative damage caused by the accumulated reactive oxygen species(ROS),thus ensuring the maintenance of normal cellular processes.Three-dimensional fluorescence analysis results indicated that the production of intracellular organic matter(IOM)in algae could be facilitated by moderate disturbance.Consequently,in-situ algae inhibition could be achieved to a certain extent by turbulence disturbance in the water bodies affected by cyanobacterial blooms.
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