Inter-Research > AME > v42 > n3 > p209-213  
Aquatic Microbial Ecology

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AME 42:209-213 (2006)  -  doi:10.3354/ame042209

Virus adsorption process determines virus susceptibility in Heterosigma akashiwo (Raphidophyceae)

Kenji Tarutani, Keizo Nagasaki*, Mineo Yamaguchi

National Research Institute of Fisheries and Environment of Inland Sea, Maruishi 2-17-5, Hatsukaichi, Hiroshima 739-0452, Japan
*Corresponding author. Email:

ABSTRACT: We compared the adsorption kinetics of Heterosigma akashiwo virus clones 01 (HaV01) and 53 (HaV53) to several other H. akashiwo strains with differing viral susceptibility spectra. When a HaV strain was inoculated into its suitable host strain, only infectious virus particles (3 to 4% of direct count estimates) adsorbed to the host cells, and the adsorption coefficient was estimated to be 4.02 to 5.44 × 10–8 ml min–1; in contrast, virus adsorption to an unsuitable host strain was not detected. This suggests that virus adsorption is an important first step in determining the sensitivity or resistance of H. akashiwo strains to viral infection, and that it determines the strain-specific host specificity of HaV.

KEY WORDS: Algal virus · Heterosigma akashiwo · Host range · Intraspecies host specificity · Viral adsorption

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