Effects of two strains of the parasitic dinoflagellate Amoebophrya on growth, photosynthesis, light absorption, and quantum yield of bloom-forming dinoflagellates

Park, Myung G.; Cooney, Sean K.; Yih, Wonho; Coats, D. Wayne

doi:10.3354/meps227281

Cited by 45 publications

(59 citation statements)

References 74 publications

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“…The production of infected cells that are much larger than uninfected individuals indicates that the parasite not only incorporates existing host biomass, but also utilizes carbon fixed by the host following infection. Amoebophrya species that fail to generate ''giant cells'' may shut down host photosynthesis early in the infection cycle, as observed for Akashiwo sanguinea, or may not incorporate newly fixed carbon as appears to be the case for Gymnodinium instriatum (Park et al 2002b). For host-parasite systems that do not shut down photosynthesis, yet don't form ''giant cells,'' host photosynthate may be lost to the aqueous environment as dissolved organic matter (DOM).…”

Section: Fungal Parasites Of Phytoplanktonmentioning

confidence: 99%

Section: Fungal Parasites Of Phytoplanktonmentioning

confidence: 99%

“…Members of the Amoebophrya ceratii complex are lethal parasites that render their hosts reproductively incompetent Elbrächter 1973;Park et al 2002b), yet little is known about the cellular processes underlying these complex parasite-host interactions. Recently, Park et al (2002b) showed that host photophysiology was altered following infection by Amoebophrya, but the magnitude and timing of changes varied with dinoflagellate species. Shortly after being infected, photosynthesis of Akashiwo sanguinea decreased sharply and lost diel periodicity, whereas parasitized Gymnodinium instriatum maintain high photosynthetic performance (ϳ 80% of uninfected cells) until very late in the infection cycle and continued to show a diel pattern in photosynthesis, albeit less pronounced than that of uninfected cells.…”

Section: Fungal Parasites Of Phytoplanktonmentioning

confidence: 99%

“…ex Akashiwo sanguinea . Since then, several other strains have been cultured and shown to have generation times of 2-4 d (Coats and Park 2002;Park et al 2002b;Sengco et al 2003). Using data for parasite prevalence in field samples and parasite development time from culture, calculated that parasite-induced mortality removed an average of Ͻ 2% of A. sanguinea populations per day in the main stem of Chesapeake Bay, far less than needed to facilitate the rapid decline of host populations.…”

Section: Fungal Parasites Of Phytoplanktonmentioning

confidence: 99%

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132  Parasites and Phytoplankton, with a Special Emphasis on Dinoflagellate Infections

Park

2003

Journal of Phycology

101

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ABSTRACT. Planktonic members of most algal groups are known to harbor intracellular symbionts, including viruses, bacteria, fungi, and protozoa. Among the dinoflagellates, viral and bacterial associations were recognized a quarter century ago, yet their impact on host populations remains largely unresolved. By contrast, fungal and protozoan infections of dinoflagellates are well documented and generally viewed as playing major roles in host population dynamics. Our understanding of fungal parasites is largely based on studies for freshwater diatoms and dinoflagellates, although fungal infections are known for some marine phytoplankton. In freshwater systems, fungal chytrids have been linked to mass mortalities of host organisms, suppression or retardation of phytoplankton blooms, and selective effects on species composition leading to successional changes in plankton communities. Parasitic dinoflagellates of the genus Amoebophrya and the newly described Perkinsozoa, Parvilucifera infectans, are widely distributed in coastal waters of the world where they commonly infect photosynthetic and heterotrophic dinoflagellates. Recent work indicates that these parasites can have significant impacts on host physiology, behavior, and bloom dynamics. Thus, parasitism needs to be carefully considered in developing concepts about plankton dynamics and the flow of material in marine food webs.

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Section: Fungal Parasites Of Phytoplanktonmentioning

confidence: 99%

Section: Fungal Parasites Of Phytoplanktonmentioning

confidence: 99%

Section: Fungal Parasites Of Phytoplanktonmentioning

confidence: 99%

Section: Fungal Parasites Of Phytoplanktonmentioning

confidence: 99%

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132  Parasites and Phytoplankton, with a Special Emphasis on Dinoflagellate Infections

Park

2003

Journal of Phycology

101

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“…The life cycle begins with small infective biflagellate cells termed dinospores (22,25,26) (see Fig. S1 in the supplemental material).…”

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confidence: 99%

Genomic Insights into Processes Driving the Infection of Alexandrium tamarense by the Parasitoid Amoebophrya sp

Wohlrab

Glöckner

et al. 2014

Eukaryot Cell

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The regulatory circuits during infection of dinoflagellates by their parasites are largely unknown on the molecular level. Here we provide molecular insights into these infection dynamics. Alexandrium tamarense is one of the most prominent harmful algal bloom dinoflagellates. Its pathogen, the dinoflagellate parasitoid Amoebophrya sp., has been observed to infect and control the blooms of this species. We generated a data set of transcripts from three time points (0, 6, and 96 h) during the infection of this parasite-host system. Assembly of all transcript data from the parasitoid (>900,000 reads/313 Mbp with 454/Roche next-generation sequencing [NGS]) yielded 14,455 contigs, to which we mapped the raw transcript reads of each time point of the infection cycle. We show that particular surface lectins are expressed at the beginning of the infection cycle which likely mediate the attachment to the host cell. In a later phase, signal transduction-related genes together with transmembrane transport and cytoskeleton proteins point to a high integration of processes involved in host recognition, adhesion, and invasion. At the final maturation stage, cell division-and proliferation-related genes were highly expressed, reflecting the fast cell growth and nuclear division of the parasitoid. Our molecular insights into dinoflagellate parasitoid interactions point to general mechanisms also known from other eukaryotic parasites, especially from the Alveolata. These similarities indicate the presence of fundamental processes of parasitoid infection that have remained stable throughout evolution within different phyla.

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Perkinsozoa, a well-known marine protozoan flagellate parasite group, newly identified in lacustrine systems: a review

Mangot

Debroas

Domaizon³

2010

Hydrobiologia

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The recurrent detection of parasitic zoospores among aquatic heterotrophic flagellates (HFs) has recently modified our view of how the microbial loop is organized, and called into question the role of eukaryotic parasites in the aquatic trophic food web. The Perkinsozoa group, already known to play a significant role as parasite in marine systems, is of special interest here, since it has recently been detected in several lakes by constructing clone libraries. In marine systems, this group is known to consist solely of intracellular parasites of molluscs or phytoplanktonic species, but their hosts in freshwater environments are still unknown, and little is yet known about their functional importance in planktonic systems. This review summarizes the main information currently available about Perkinsozoa through a description of their phylogenetic position, their life cycles, and regulatory factors, and the consideration of the specificities of their hosts in marine systems, and the few data recently acquired in lakes.

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Effects of two strains of the parasitic dinoflagellate Amoebophrya on growth, photosynthesis, light absorption, and quantum yield of bloom-forming dinoflagellates

Cited by 45 publications

References 74 publications

132  Parasites and Phytoplankton, with a Special Emphasis on Dinoflagellate Infections

132  Parasites and Phytoplankton, with a Special Emphasis on Dinoflagellate Infections

Genomic Insights into Processes Driving the Infection of Alexandrium tamarense by the Parasitoid Amoebophrya sp

Perkinsozoa, a well-known marine protozoan flagellate parasite group, newly identified in lacustrine systems: a review

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Effects of two strains of the parasitic dinoflagellate Amoebophrya on growth, photosynthesis, light absorption, and quantum yield of bloom-forming dinoflagellates

Cited by 45 publications

References 74 publications

132 Parasites and Phytoplankton, with a Special Emphasis on Dinoflagellate Infections

132 Parasites and Phytoplankton, with a Special Emphasis on Dinoflagellate Infections

Genomic Insights into Processes Driving the Infection of Alexandrium tamarense by the Parasitoid Amoebophrya sp

Perkinsozoa, a well-known marine protozoan flagellate parasite group, newly identified in lacustrine systems: a review

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132  Parasites and Phytoplankton, with a Special Emphasis on Dinoflagellate Infections

132  Parasites and Phytoplankton, with a Special Emphasis on Dinoflagellate Infections