Viral mortality in the final stage of <i>Heterosigma akashiwo</i> (Raphidophyceae) red tide

Nagasaki, Keisuke; Andô, Masashi; Itakura, Shigeru; Imai, Ichiro; Ishida, Yūzaburō

doi:10.1093/plankt/16.11.1595

Cited by 112 publications

(84 citation statements)

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“…Viruses have been implicated for some time as agents of bloom decline of freshwater cyanobacteria (reviewed in Martin & Benson 1988) and eukaryotic phytoplankton (Bratbak et al 1990, Nagasaki et al 1994. However, the role of viruses in bloom decline of macroscopic cyanobacterial species has not been previously investigated.…”

Section: Discussionmentioning

confidence: 99%

Virus-like particles associated with Lyngbya majuscula (Cyanophyta; Oscillatoriacea) bloom decline in Moreton Bay, Australia

Hewson¹,

O’Neil²,

Dennison³

2001

Aquat. Microb. Ecol.

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Expansive blooms of the toxic cyanobacterium Lyngbya majuscula were observed in 2 shallow water regions of Moreton Bay, Australia. The rapid bloom decline (8 to <1 km 2 in < 7 d) prompted an investigation of the role of cyanophage viruses in the ecophysiology of L. majuscula. Virus-like particles produced by decaying L. majuscula were observed using electron microscopy. The virus-like particles were similar in morphology to viruses in the genus Cyanostyloviridae. The effect of viruses on L. majuscula photosynthesis was investigated by: (1) creating a virus concentrate using tangential-flow ultrafiltration of seawater surrounding L. majuscula; (2) inoculating L. majuscula with the concentrate; and (3) measuring photosynthetic response using a pulse-amplitude modulated fluorometer. Virus concentrate addition resulted in decreased initial fluorescence, decreased photochemical efficiency and decreased electron transport rate in rapid light curves after 5 d. Viruses present within L. majuscula filaments may play an important role in the bloom dynamics of this ecologically important cyanobacterium. KEY WORDS: Lyngbya majuscula · Cyanophage · Virus · LysogenyResale or republication not permitted without written consent of the publisher

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Section: Discussionmentioning

confidence: 99%

Virus-like particles associated with Lyngbya majuscula (Cyanophyta; Oscillatoriacea) bloom decline in Moreton Bay, Australia

Hewson¹,

O’Neil²,

Dennison³

2001

Aquat. Microb. Ecol.

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“…In the case of red tides of Heterosigma akashiwo and Heterocapsa circularisquama, virus-induced mortality was demonstrated to be an important factor contributing to the rapid termination of red tides (Nagasaki et al 1994(Nagasaki et al , 2004. Viruses infectious to microalgae are usually host specific.…”

Section: Red Tide Control By Virusesmentioning

confidence: 99%

Eutrophication and occurrences of harmful algal blooms in the Seto Inland Sea, Japan

Imai

Yamaguchi

Hori

2006

Plankton Benthos Res

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235

126

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“…Therefore they play important roles in nutrient (Wilhelm and Suttle 1999) and biogeochemical (Fuhrmann 1999) cycling, and influence structure and diversity of microbial and phytoplankton communities (Fuhrmann 1999, Wommack andColwell 2000). Viruses have also been observed to infect a wide range of aquatic algae (Van Etten et al, 1991, Van Etten andMeints 1999), including bloom-forming marine phytoplankton (Nagasaki et al, 1994a, 1994b, Jacobsen et al, 1996, Nagasaki and Yamaguchi 1997, Sandaa et al, 2001.…”

Section: Introductionmentioning

confidence: 99%

Pilot study of an EST approach of the coccolithophorid Emiliania huxleyi during a virus infection

Kegel

Allen

Metfies

et al. 2007

Gene

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Blooms of the coccolithophorid Emiliania huxleyi can be infected by viruses, which can lead to bloom-termination. This pilot study used an expressed sequence tag (EST) approach to get a first view of gene-expression changes that occur during viral infection of E. huxleyi. cDNA libraries were constructed from uninfected cultures and 6, 12, and 24 h after infection with E. huxleyi-specific virus 86 (EhV-86). From each library 60-90 ESTs were randomly selected and annotated manually with PhyloGena. Viral genes were identified using BLAST-Search of the known viral genome. The data of this study show, that 6 h after viral infection the algal transcriptome changed significantly although few viral transcripts were present. At this point, changes mainly concerned transcripts related to photosynthesis and protein metabolism. However, after 24 h viral transcripts were most abundant. Viral transcripts found at this stage of viral infection encode proteins involved in protein degradation, nucleic acid degradation, transcription and replication.

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Viral mortality in the final stage of Heterosigma akashiwo (Raphidophyceae) red tide

Cited by 112 publications

References 0 publications

Virus-like particles associated with Lyngbya majuscula (Cyanophyta; Oscillatoriacea) bloom decline in Moreton Bay, Australia

Virus-like particles associated with Lyngbya majuscula (Cyanophyta; Oscillatoriacea) bloom decline in Moreton Bay, Australia

Eutrophication and occurrences of harmful algal blooms in the Seto Inland Sea, Japan

Pilot study of an EST approach of the coccolithophorid Emiliania huxleyi during a virus infection

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