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Microalgae Cultivation and Biomass Quantification in a Bench-Scale Photobioreactor with Corrosive Flue Gases
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Communication mediated interaction between bacteria and microalgae advances photogranulation.

Xiaogang Wu1, Lingrui Kong1, Yiming Feng1

  • 1College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing 100871, China.

The Science of the Total Environment
|January 13, 2024
PubMed
Summary

Signaling communication between bacteria and microalgae is crucial for forming carbon-negative nitrogen removal photogranules. Signaling bacteria, like Thauera, adapt better, dominate interactions, and enhance nitrogen removal rates.

Keywords:
Bacterial and algal interactionsCo-abundance groupIndole-3-acetic acidN-acyl homoserine lactonesQuorum sensingSignaling communication

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Area of Science:

  • Microbial ecology
  • Environmental microbiology
  • Biotechnology

Background:

  • Photogranules comprising bacteria and microalgae are vital for carbon-negative nitrogen removal.
  • The role of specific bacteria and intercellular communication in photogranule formation remains unclear.

Purpose of the Study:

  • To investigate the influence of bacterial signaling molecules (indole-3-acetic acid and N-acyl homoserine lactones) on photogranule development.
  • To determine if signaling communication enhances bacterial adaptability and interaction with microalgae.

Main Methods:

  • Metagenomic analysis of bacterial and microalgal communities in photo-bioreactors.
  • Analysis of signaling molecule production (IAA and AHLs) by bacteria.
  • Network analysis to assess microbial interactions and keystone nodes.

Main Results:

  • Signaling bacteria, particularly Thauera, showed increased abundance and better adaptation to co-culture conditions.
  • Signaling bacteria dominated interactions within the phycosphere and formed more abundant co-abundance groups.
  • Signaling bacteria acted as keystone nodes, facilitating crucial interactions with microalgae and positively correlating with nitrogen removal rates.

Conclusions:

  • Bacterial signaling communication is essential for the rapid formation and stability of photogranules.
  • Signaling pathways enhance bacterial survival, colonization, and symbiotic relationships with microalgae.
  • This study deepens the understanding of microbial sociobiology in engineered ecosystems for environmental applications.