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Absence of Lytic Virus in Two Species of Symbiotic Algae within the Sea Anemone Anthopleura xanthogrammica (Coelenterata: Anthozoa)

Timothy L. O'Brien, R. MacLeod and M. C. Maclean
Transactions of the American Microscopical Society
Vol. 103, No. 3 (Jul., 1984), pp. 228-232
Published by: Wiley on behalf of American Microscopical Society
DOI: 10.2307/3226183
Stable URL: http://www.jstor.org/stable/3226183
Page Count: 5
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Absence of Lytic Virus in Two Species of Symbiotic Algae within the Sea Anemone Anthopleura xanthogrammica (Coelenterata: Anthozoa)
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Abstract

The production of lytic algal viruses, or virus-like particles, by symbiotic algae isolated from Hydra viridis and Anthopleura xanthogrammica was monitored by sucrose-gradient fractionation of the algal lysates and by transmission electron microscopy. Viral particles were detected readily in algae isolated from H. viridis; however, virus-like particles were absent from either of the two species of symbiotic algae isolated from A. xanthogrammica. We propose the following hypothesis: the presence of lytic algal viruses in fresh-water algal-invertebrate symbiosis and the apparent absence of such viruses in marine algal-invertebrate symbiosis may represent a fundamental distinction, not previously recognized, between fresh-water and marine algal-invertebrate symbiosis.

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