A multigene phylogeny of Olpidium and its implications for early fungal evolution

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dc.contributor.authorSekimoto, Satoshi
dc.contributor.authorRochon, D'Ann
dc.contributor.authorLong, Jennifer E.
dc.contributor.authorDee, Jaclyn M.
dc.contributor.authorBerbee, Mary L.
dc.contributor.otherUniversity of British Columbia
dc.contributor.otherAgriculture & Agri Food Canada
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.contributor.otherUniversity of Victoria
dc.date.accessioned2023-10-02T15:14:26Z
dc.date.available2023-10-02T15:14:26Z
dc.date.issued2011
dc.description.abstractBackground: From a common ancestor with animals, the earliest fungi inherited flagellated zoospores for dispersal in water. Terrestrial fungi lost all flagellated stages and reproduce instead with nonmotile spores. Olpidium virulentus (= Olpidium brassicae), a unicellular fungus parasitizing vascular plant root cells, seemed anomalous. Although Olpidium produces zoospores, in previous phylogenetic studies it appeared nested among the terrestrial fungi. Its position was based mainly on ribosomal gene sequences and was not strongly supported. Our goal in this study was to use amino acid sequences from four genes to reconstruct the branching order of the early-diverging fungi with particular emphasis on the position of Olpidium. Results: We concatenated sequences from the Ef-2, RPB1, RPB2 and actin loci for maximum likelihood and Bayesian analyses. In the resulting trees, Olpidium virulentus, O. bornovanus and non-flagellated terrestrial fungi formed a strongly supported clade. Topology tests rejected monophyly of the Olpidium species with any other clades of flagellated fungi. Placing Olpidium at the base of terrestrial fungi was also rejected. Within the terrestrial fungi, Olpidium formed a monophyletic group with the taxa traditionally classified in the phylum Zygomycota. Within Zygomycota, Mucoromycotina was robustly monophyletic. Although without bootstrap support, Monoblepharidomycetes, a small class of zoosporic fungi, diverged from the basal node in Fungi. The zoosporic phylum Blastocladiomycota appeared as the sister group to the terrestrial fungi plus Olpidium. Conclusions: This study provides strong support for Olpidium as the closest living flagellated relative of the terrestrial fungi. Appearing nested among hyphal fungi, Olpidium's unicellular thallus may have been derived from ancestral hyphae. Early in their evolution, terrestrial hyphal fungi may have reproduced with zoospores.en_US
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.citationSekimoto, S., Rochon, D., Long, J. E., Dee, J. M., & Berbee, M. L. (2011). A multigene phylogeny of Olpidium and its implications for early fungal evolution. In BMC Evolutionary Biology (Vol. 11, Issue 1, p. 331). Springer Science and Business Media LLC. https://doi.org/10.1186/1471-2148-11-331
dc.identifier.doi10.1186/1471-2148-11-331
dc.identifier.urihttps://ir.ua.edu/handle/123456789/12443
dc.languageEnglish
dc.language.isoen_US
dc.publisherBMC
dc.rights.licenseAttribution 4.0 International (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectMOLECULAR PHYLOGENY
dc.subjectZOOSPORE ULTRASTRUCTURE
dc.subjectVIRUS TRANSMISSION
dc.subjectZYGOMYCOTA
dc.subjectCHYTRIDIOMYCOTA
dc.subjectGLOMEROMYCOTA
dc.subjectEF-1-ALPHA
dc.subjectBRASSICAE
dc.subjectMUCORALES
dc.subjectORIGINS
dc.subjectEvolutionary Biology
dc.subjectGenetics & Heredity
dc.titleA multigene phylogeny of Olpidium and its implications for early fungal evolutionen_US
dc.typeArticle
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