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Other Algae01:19

Other Algae

The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
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Planctomycetes diversity associated with macroalgae.

Olga Maria Lage1, Joana Bondoso

  • 1Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal. olga.lage@fc.up.pt

FEMS Microbiology Ecology
|July 6, 2011
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Researchers isolated novel Planctomycetes bacteria from Portuguese macroalgae, revealing unique species and confirming their close association with seaweed surfaces. This study highlights the diverse microbial communities living on marine algae.

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Area of Science:

  • Marine microbiology
  • Bacteriology
  • Phycology

Background:

  • Planctomycetes are a diverse bacterial phylum found in various aquatic environments.
  • Macroalgae host complex epiphytic microbial communities, but their bacterial diversity remains underexplored.
  • Understanding these associations is crucial for marine ecosystem functioning.

Purpose of the Study:

  • To isolate and characterize Planctomycetes associated with macroalgae from the Portuguese coast.
  • To investigate the diversity and novelty of these epiphytic bacteria.
  • To confirm the presence and relationship of Planctomycetes on macroalgal surfaces.

Main Methods:

  • Improved isolation techniques for culturing bacteria from macroalgae.
  • 16S rRNA gene sequencing for operational taxonomic unit (OTU) delineation.
  • Catalyzed reporter deposition-fluorescence in situ hybridization (CARD-FISH) for in situ detection.

Main Results:

  • 138 Planctomycetes isolates were obtained from 12 macroalgae species.
  • 10 distinct OTUs were identified, with 65% related to Rhodopirellula baltica.
  • Several novel species or genera, potentially belonging to Rhodopirellula, Blastopirellula, and Planctomyces, were discovered.
  • CARD-FISH confirmed Planctomycetes presence on macroalgal surfaces.

Conclusions:

  • This study reports the first cultured diversity of Planctomycetes associated with epiphytic macroalgae.
  • Novel Planctomycetes taxa were identified, expanding known bacterial diversity in this niche.
  • Evidence supports an intimate nutritional relationship between Planctomycetes and macroalgae.