Effect of the N-hexanoyl-L-homoserine Lactone on the Carbon Fixation Capacity of the Algae–Bacteria System

Lei Liao, Bin Chen, Kaikai Deng, Qiang He, Guijiao Lin, Jinsong Guo () and Peng Yan ()
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Lei Liao: College of Environment and Ecology, Chongqing University, Chongqing 400045, China
Bin Chen: College of Environment and Ecology, Chongqing University, Chongqing 400045, China
Kaikai Deng: College of Environment and Ecology, Chongqing University, Chongqing 400045, China
Qiang He: College of Environment and Ecology, Chongqing University, Chongqing 400045, China
Guijiao Lin: College of Environment and Ecology, Chongqing University, Chongqing 400045, China
Jinsong Guo: College of Environment and Ecology, Chongqing University, Chongqing 400045, China
Peng Yan: College of Environment and Ecology, Chongqing University, Chongqing 400045, China

IJERPH, 2023, vol. 20, issue 6, 1-14

Abstract: Algae–bacteria systems are used widely in wastewater treatment. N-hexanoyl-L-homoserine lactone (AHL) plays an important role in algal-bacteria communication. However, little study has been conducted on the ability of AHLs to regulate algal metabolism and the carbon fixation ability, especially in algae–bacteria system. In this study, we used the Microcystis aeruginosa + Staphylococcus ureilyticus strain as a algae–bacteria system. The results showed that 10 ng/L C 6 -HSL effectively increased the chlorophyll-a (Chl-a) concentration and carbon fixation enzyme activities in the algae–bacteria group and algae group, in which Chl-a, carbonic anhydrase activity, and Rubisco enzyme increased by 40% and 21%, 56.4% and 137.65%, and 66.6% and 10.2%, respectively, in the algae–bacteria group and algae group, respectively. The carbon dioxide concentration mechanism (CCM) model showed that C 6 -HSL increased the carbon fixation rate of the algae–bacteria group by increasing the CO 2 transport rate in the water and the intracellular CO 2 concentration. Furthermore, the addition of C 6 -HSL promoted the synthesis and secretion of the organic matter of algae, which provided biogenic substances for bacteria in the system. This influenced the metabolic pathways and products of bacteria and finally fed back to the algae. This study provided a strategy to enhance the carbon fixation rate of algae–bacteria consortium based on quorum sensing.

Keywords: algae–bacteria system; C 6 -HSL; inorganic carbon; CCM model; carbon fixation capacity (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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