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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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Different co-occurring bacteria enhance or decrease the growth of the microalga Nannochloropsis sp. CCAP211/78.

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Marine microalgae in bioreactors interact with bacteria, impacting growth. This study identified beneficial and harmful bacterial strains, aiding future algal cultivation strategies.

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Area of Science:

  • Marine Microbiology
  • Algal Biotechnology
  • Photobioreactor Technology

Background:

  • Marine microalgae commonly associate with bacteria in natural environments.
  • The impact of bacterial communities on microalgal cultures in photobioreactors remains poorly understood.
  • Nannochloropsis sp. is a key marine microalga with significant biotechnological potential.

Purpose of the Study:

  • To investigate the influence of naturally associated bacteria on the growth of Nannochloropsis sp. in controlled conditions.
  • To develop and validate a screening method for assessing bacterial effects on microalgal cultures.
  • To identify specific bacterial strains that either promote or inhibit microalgal growth.

Main Methods:

  • Isolation of eighteen bacterial strains from Nannochloropsis sp. cultures in pilot-scale photobioreactors.
  • Classification of bacterial isolates using molecular affiliation, with a majority belonging to Alphaproteobacteria and Flavobacteriia.
  • Co-culturing experiments using 24-well plates and custom LED boxes to assess the impact of individual bacterial strains on Nannochloropsis sp. growth, measured by chlorophyll concentration.

Main Results:

  • Co-culturing revealed distinct growth responses of Nannochloropsis sp. to different bacterial strains.
  • Two strains, Maritalea porphyrae (DMSP31) and Labrenzia aggregata (YP26), significantly enhanced microalgal growth, increasing chlorophyll by 14% and 12%, respectively.
  • A flavobacterial strain (YP206) significantly inhibited growth, reducing chlorophyll concentration by 28%.

Conclusions:

  • The developed screening technique efficiently identifies beneficial and harmful bacteria in microalgal cultures.
  • Bacterial interactions can profoundly influence microalgal productivity in cultivation systems.
  • Algal production systems can serve as a source for isolating microorganisms that modulate algal growth, offering potential for optimizing cultivation.