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A new isolation method for labyrinthulids using a bacterium, Psychrobacter phenylpyruvicus.

T Yokochi1, T Nakahara, T Higashihara

  • 1National Institute of Bioscience and Human-Technology, Higashi 1-1, Tsukuba, Ibaraki 305-8566 Japan.

Marine Biotechnology (New York, N.Y.)
|February 13, 2004
PubMed
Summary

A novel method enhances marine microbe isolation by using the bacterium Psychrobacter phenylpyruvicus on mangrove leaves. This technique significantly improves the isolation of labyrinthulids compared to traditional methods.

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Area of Science:

  • Marine microbiology
  • Protistan biology

Background:

  • Labyrinthulids are marine microbes with unique cell shapes and motility.
  • Isolating labyrinthulids is challenging and less reproducible than for related organisms like thraustochytrids.
  • Previous isolation methods relied on serum seawater agar with antibiotics.

Purpose of the Study:

  • To develop a more effective and reproducible method for isolating labyrinthulids.
  • To investigate the role of specific marine bacteria in enhancing labyrinthulid isolation.

Main Methods:

  • Utilizing fallen mangrove leaves as a source material for labyrinthulid isolation.
  • Inoculating agar media with the marine bacterium Psychrobacter phenylpyruvicus prior to sample placement.
  • Comparing the efficacy of the new method against standard isolation agar without bacteria.

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Main Results:

  • The new method, using P. phenylpyruvicus on mangrove leaves, was over twice as effective as standard isolation agar.
  • Bacterial colonies appeared to inhibit the overgrowth of fungal mycelium, aiding labyrinthulid isolation.
  • P. phenylpyruvicus proved more effective for isolation than Shewanella sp. or Rhodotorula rubra.

Conclusions:

  • The co-cultivation of labyrinthulids with P. phenylpyruvicus represents a significant advancement in isolation techniques.
  • This improved method offers greater efficiency and reproducibility for studying labyrinthulids.
  • The findings provide a foundation for further research into microbial interactions in marine environments.