Virus-like Particles Suppress Growth of the
Red-Tide-Forming Marine Dinoflagellate
<Emphasis Type="Underline">Gymnodinium mikimotoi</Emphasis> |
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Authors: | Masashi Onji Shin-ichi Nakano Satoru Suzuki |
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Institution: | (1) Center for Marine Environmental Studies, Ehime University, Matsuyama 790-8577, Japan |
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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. |
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Keywords: | Gymnodinium mikimotoi virus red tide |
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