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Phylogeny, Evidence for a Cryptic Plastid, and Distribution of Chytriodinium Parasites (Dinophyceae) Infecting Copepods
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Systematic Biology. Univ British Columbia, Dept Bot, 3529-6270 Univ Blvd, Vancouver, BC V6T 1Z4, Canada.
Univ British Columbia, Dept Bot, 3529-6270 Univ Blvd, Vancouver, BC V6T 1Z4, Canada;Monterey Bay Aquarium Res Inst, 7700 Sandholdt Rd, Moss Landing, CA 95039 USA.ORCID iD: 0000-0001-7810-1336
Univ British Columbia, Dept Bot, 3529-6270 Univ Blvd, Vancouver, BC V6T 1Z4, Canada;CSIC, Inst Ciencies Mar, Dept Biol Marina & Oceanog, Passeig Maritim Barceloneta 37-49, E-08003 Barcelona, Spain.
Univ British Columbia, Dept Bot, 3529-6270 Univ Blvd, Vancouver, BC V6T 1Z4, Canada.
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2019 (English)In: Journal of Eukaryotic Microbiology, ISSN 1066-5234, E-ISSN 1550-7408, Vol. 66, no 4, p. 574-581Article in journal (Refereed) Published
Abstract [en]

Spores of the dinoflagellate Chytriodinium are known to infest copepod eggs causing their lethality. Despite the potential to control the population of such an ecologically important host, knowledge about Chytriodinium parasites is limited: we know little about phylogeny, parasitism, abundance, or geographical distribution. We carried out genome sequence surveys on four manually isolated sporocytes from the same sporangium, which seemed to be attached to a copepod nauplius, to analyze the phylogenetic position of Chytriodinium based on SSU and concatenated SSU/LSU rRNA gene sequences, and also characterize two genes related to the plastidial heme pathway, hemL and hemY. The results suggest the presence of a cryptic plastid in Chytriodinium and a photosynthetic ancestral state of the parasitic Chytriodinium/Dissodinium clade. Finally, by mapping Tara Oceans V9 SSU amplicon data to the recovered SSU rRNA gene sequences from the sporocytes, we show that globally, Chytriodinium parasites are most abundant within the pico/nano- and mesoplankton of the surface ocean and almost absent within microplankton, a distribution indicating that they generally exist either as free-living spores or host-associated sporangia.

Place, publisher, year, edition, pages
2019. Vol. 66, no 4, p. 574-581
Keywords [en]
Dinoflagellates, Gymnodinium, heme pathway, plankton, protists
National Category
Microbiology Evolutionary Biology
Identifiers
URN: urn:nbn:se:uu:diva-390995DOI: 10.1111/jeu.12701ISI: 000474643200005PubMedID: 30444565OAI: oai:DiVA.org:uu-390995DiVA, id: diva2:1343807
Funder
EU, FP7, Seventh Framework Programme, FP7-PEOPLE-2012-IOF - 331450 CAARLAvailable from: 2019-08-19 Created: 2019-08-19 Last updated: 2019-08-19Bibliographically approved

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Strassert, Jürgen F. H.

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