Cyanophages and Viruses of Eukaryotic Algae

Sherman, Louis A.; BrownJr., R. Malcolm

doi:10.1007/978-1-4684-2724-0_3

Cited by 19 publications

(12 citation statements)

References 142 publications

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“…Because the LVLPs are so large, they are unlikely to be bactenophages or cyanophages (e.g. Sherman & Brown 1978, Frank & Moebus 1987, Proctor & Fuhrman 1990, Waterbury 1992, although the recent discovery of a bacterium that reaches a length of 600 pm (Angert et al 1993) (Gowing 1989), and when this occurs, cellular remnants in the form of trichocysts should persist in vacuoles. In the present data set, < 1 % of the vacuoles either with or without LVLPs contained trichocysts, suggesting that dinoflagellates were not a common food item for these phaeodarians and were unlikely to be the source of the LVLPs.…”

Section: Resultsmentioning

confidence: 99%

Large virus-like particles from vacuoles of phaeodarian radiolarians and from other marine samples

Gowing¹

1993

Mar. Ecol. Prog. Ser.

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Large icosahedral virus-like particles (LVLPs) ranging in dameter from ca 300 to 750 nm occurred in food or waste vacuoles of phaeodarian radiolarians collected in the Paciflc Ocean, the Sargasso Sea and the Weddell Sea. The samples were from coastal to open-ocean waters, surface waters to 2000 m depth, and a variety of seasons. A few LVLPs were also found in bulk sediment trap material, in zooplankton guts and fecal pellets, and in minipellets. Phaeodarians are unique among small marine organisms because they carry a record of their past feeding activity within their phaeodium, a collection of food and waste vacuoles. This probably explains why they often contain abundant LVLPs. Phaeodarians appeared to have acquired the LVLPs while feeding on sinking or suspended particulate material. Calculations based on serial sections indicate that a single phaeodarian could contain thousands of LVLPs. Although their hosts have not been determined, LVLPs are clearly ubiquitous. These particles are being called LVLPs because of similarities in morphology with viruses, but they could be as yet unidentified microorganisms, a type of spore, or possibly an organelle of a eukaryote.

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Section: Resultsmentioning

confidence: 99%

Large virus-like particles from vacuoles of phaeodarian radiolarians and from other marine samples

Gowing¹

1993

Mar. Ecol. Prog. Ser.

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“…One is that aquatic viruses are largely speciesspecific (Sherman & Brown 1978). The lower VBR observed in the late spring could then be due to the proliferation of bacteria which are resistant to phage infection.…”

Section: Discussionmentioning

confidence: 99%

Viral and bacterial dynamics in Arctic sea ice during the spring algal bloom near Resolute, N.W.T., Canada

Maranger¹,

Juniper²

1994

Mar. Ecol. Prog. Ser.

160

109

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“…Eukaryotic algal viruses are a poorly studied group (for review, see Sherman & Brown, 1978). This algal virus system is of particular interest as the host cells are naked at all times, a feature more commonly associated with animal cells.…”

Section: Introductionmentioning

confidence: 99%

Micromonas pusilla Virus: the Virus Growth Cycle and Associated Physiological Events Within the Host Cells; Host Range Mutation

Waters

Chan

1982

Journal of General Virology

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SUMMARYThe photosynthetic marine flagellate Micromonas pusilla (Butch.) Manton et Parke (Prasinophyceae) and its cytoplasmic virus, M. pusilla virus (MPV), were cloned. Host cells were maintained in liquid culture. Infectivity titration was by endpoint dilution, using loss of host chlorophyll as an indicator of the presence of infective virus. The virus growth cycle was characterized by an eclipse period of 3 h, a latent period of 7 h and a total lytic cycle of 14 h. The average burst size was 72 infective particles per cell. Inhibition of CO2 photoassimilation began 2 h after inoculation with virus. An almost immediate decrease in in vivo chlorophyll a fluorescence in infected cells was lightdependent. M. pusilla cells can mutate to virus resistance at the cell surface. Host range mutants of MPV exhibited variable infectivity in different strains of M. pusilla.

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Cyanophages and Viruses of Eukaryotic Algae

Cited by 19 publications

References 142 publications

Large virus-like particles from vacuoles of phaeodarian radiolarians and from other marine samples

Large virus-like particles from vacuoles of phaeodarian radiolarians and from other marine samples

Viral and bacterial dynamics in Arctic sea ice during the spring algal bloom near Resolute, N.W.T., Canada

Micromonas pusilla Virus: the Virus Growth Cycle and Associated Physiological Events Within the Host Cells; Host Range Mutation

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