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Marine Biotechnology

, Volume 5, Issue 5, pp 435–442 | Cite as

Virus-like Particles Suppress Growth of the Red-Tide-Forming Marine Dinoflagellate Gymnodinium mikimotoi

  • Masashi Onji
  • Shin-ichi Nakano
  • Satoru Suzuki
Original Contributions

Abstract

We isolated 2 virus-like agents that suppressed growth of Gymnodinium mikimotoi from coastal waters of the Uwa Sea, Japan. The agents found in the flagellate cells, named GM6 and GM7, were filterable in a 0.22-lm-pore filter with approximately 100-nm shapes. Electron microscopic observation showed the presence of virus-like particles in severely damaged G. mikimotoi cells infected by GM6. The growth-suppression activity of the agents (GM6 or GM7) was lost by heating at 50°C, with treatments of DNase and protease, and filtration through a 0.05-lm filter. Our results suggest that the agents are DNA viruses infectious to and virulent for G. mikimotoi. This is the first report of a virus-like agent specific to G. mikimotoi.

Keywords

Gymnodinium mikimotoi virus red tide 

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Masashi Onji
    • 1
  • Shin-ichi Nakano
    • 1
  • Satoru Suzuki
    • 1
  1. 1.Center for Marine Environmental Studies, Ehime University, Matsuyama 790-8577Japan

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