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Updated: Jun 18, 2026
07:51
A Multi-Omics Extraction Method for the In-Depth Analysis of Synchronized Cultures of the Green Alga Chlamydomonas reinhardtii
Published on: August 8, 2019
Quorum sensing molecule C8-HSL enhances Chlorella growth and lipid accumulation via ROS mediated metabolic
Li Chen1, Yuan Sun2, Jing Yang1
1Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China; Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture and Rural Affairs, Chengdu 610041, China.
Bioresource Technology
|June 16, 2026
Summary
N-octanoyl-l-homoserine lactone (C8-HSL) enhances microalgal growth and lipid production by regulating carbon allocation. This process involves reactive oxygen species (ROS) and boosts biomass and lipid yields.
Area of Science:
- Biotechnology
- Microbiology
- Algal Research
Background:
- Quorum sensing molecules regulate microbial metabolism, but their role in microalgal carbon allocation is unclear.
- Understanding microalgal carbon allocation is key for optimizing biomass and lipid production.
Purpose of the Study:
- Investigate the effects of N-octanoyl-l-homoserine lactone (C8-HSL) on Chlorella sp. growth and lipid accumulation.
- Determine the involvement of reactive oxygen species (ROS) in C8-HSL-mediated effects.
- Explore the molecular mechanisms of C8-HSL on carbon allocation and lipid synthesis.
Main Methods:
- Cultivation of Chlorella sp. with and without C8-HSL.
- Measurement of cell density, neutral lipid content, and lipid productivity.
- Analysis of intracellular reactive oxygen species (ROS) levels and antioxidant responses.
- Transcriptomic analysis to identify affected metabolic pathways.
- Experimentation with antioxidant supplementation to confirm ROS involvement.
Main Results:
- C8-HSL significantly increased cell density by 30.9% and enhanced neutral lipid content (33.1%) and lipid productivity (25.1%).
- C8-HSL treatment led to elevated intracellular ROS levels and activated antioxidant defense mechanisms.
- Transcriptomic analysis revealed upregulation of genes involved in photosynthesis, carbon metabolism, and fatty acid biosynthesis.
- Antioxidant supplementation reduced C8-HSL-induced lipid accumulation, confirming ROS mediation.
Conclusions:
- C8-HSL promotes microalgal growth and lipid accumulation through ROS-associated metabolic regulation.
- This study provides a potential strategy for enhancing microalgal biomass and lipid production under non-stress conditions.
- C8-HSL influences carbon allocation towards lipid synthesis in Chlorella sp.
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