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Related Experiment Video

Updated: Feb 15, 2026

Exploring the Root Microbiome: Extracting Bacterial Community Data from the Soil, Rhizosphere, and Root Endosphere
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Exploring the Cultivable Ectocarpus Microbiome.

Hetty KleinJan1, Christian Jeanthon2,3, Catherine Boyen1

  • 1Sorbonne Universités, CNRS-UPMC, Station Biologique de Roscoff, UMR8227, Integrative Biology of Marine Models, Roscoff, France.

Frontiers in Microbiology
|January 10, 2018
PubMed
Summary

Researchers cultivated bacteria associated with the brown macroalga Ectocarpus subulatus, identifying 33 genera. This collection aids in studying algal-bacterial interactions and improving macroalgal cultivation for industrial and ecological applications.

Keywords:
Ectocarpusbacterial cultivationbrown macroalgaedilution-to-extinctionholobiontmetabarcoding

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Area of Science:

  • Marine microbiology
  • Phycology
  • Eukaryotic algal biology

Background:

  • Brown macroalgae are ecologically vital and industrially relevant organisms found in coastal areas.
  • The microbiome associated with macroalgae significantly influences their growth, development, and physiology.
  • Ectocarpus subulatus is a model organism for studying brown algal physiology and microbiomes, with salinity tolerance dependent on associated microbes.

Purpose of the Study:

  • To cultivate and extensively collect bacteria associated with the freshwater strain Ectocarpus subulatus.
  • To establish a foundation for in vitro functional studies of brown algal-bacterial interactions under abiotic stress.
  • To understand the molecular mechanisms behind microbial influence on algal salinity tolerance.

Main Methods:

  • Applied diverse isolation techniques including direct plating and dilution-to-extinction.
  • Utilized chemically defined and undefined growth media for bacterial cultivation.
  • Inoculated with algal tissue or growth media, with pre-treatments like antibiotics, filtration, or cell wall digestion.

Main Results:

  • Successfully isolated and identified 388 bacterial strains belonging to 33 genera, with Halomonas, Bosea, and Limnobacter being most abundant.
  • Achieved a high culturability rate of approximately 50% compared to 16S rRNA gene metabarcoding data.
  • Identified cultivable strains not detected or found in low abundance in metabarcoding data, potentially representing the rare biosphere.

Conclusions:

  • The study provides a comprehensive collection of cultivable Ectocarpus subulatus-associated bacteria.
  • This collection is crucial for future in vitro studies on algal-bacterial interactions and stress responses.
  • The findings highlight the importance of the rare biosphere in temporal dynamics of the Ectocarpus microbiome.