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

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  • Lei Liao

    (College of Environment and Ecology, Chongqing University, Chongqing 400045, China
    Key Laboratory of Ecological Environment of Three Gorges Reservoir Area, Ministry of Education, Chongqing 400045, China)

  • Bin Chen

    (College of Environment and Ecology, Chongqing University, Chongqing 400045, China
    Key Laboratory of Ecological Environment of Three Gorges Reservoir Area, Ministry of Education, Chongqing 400045, China)

  • Kaikai Deng

    (College of Environment and Ecology, Chongqing University, Chongqing 400045, China
    Key Laboratory of Ecological Environment of Three Gorges Reservoir Area, Ministry of Education, Chongqing 400045, China)

  • Qiang He

    (College of Environment and Ecology, Chongqing University, Chongqing 400045, China
    Key Laboratory of Ecological Environment of Three Gorges Reservoir Area, Ministry of Education, Chongqing 400045, China)

  • Guijiao Lin

    (College of Environment and Ecology, Chongqing University, Chongqing 400045, China
    Key Laboratory of Ecological Environment of Three Gorges Reservoir Area, Ministry of Education, Chongqing 400045, China)

  • Jinsong Guo

    (College of Environment and Ecology, Chongqing University, Chongqing 400045, China
    Key Laboratory of Ecological Environment of Three Gorges Reservoir Area, Ministry of Education, Chongqing 400045, China)

  • Peng Yan

    (College of Environment and Ecology, Chongqing University, Chongqing 400045, China
    Key Laboratory of Ecological Environment of Three Gorges Reservoir Area, Ministry of Education, Chongqing 400045, China)

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.

Suggested Citation

  • Lei Liao & Bin Chen & Kaikai Deng & Qiang He & Guijiao Lin & Jinsong Guo & Peng Yan, 2023. "Effect of the N-hexanoyl-L-homoserine Lactone on the Carbon Fixation Capacity of the Algae–Bacteria System," IJERPH, MDPI, vol. 20(6), pages 1-14, March.
    • Handle: RePEc:gam:jijerp:v:20:y:2023:i:6:p:5047-:d:1095640
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    References listed on IDEAS

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    1. Xin Chen & Stephan Schauder & Noelle Potier & Alain Van Dorsselaer & István Pelczer & Bonnie L. Bassler & Frederick M. Hughson, 2002. "Structural identification of a bacterial quorum-sensing signal containing boron," Nature, Nature, vol. 415(6871), pages 545-549, January.
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