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Revised Taxonomy and Expanded Biodiversity of the Phytomyxea (Rhizaria, Endomyxa).

Authors
  • Hittorf, Michaela1
  • Letsch-Praxmarer, Susanne1
  • Windegger, Alexandra1
  • Bass, David2, 3
  • Kirchmair, Martin1
  • Neuhauser, Sigrid1
  • 1 Institute of Microbiology, University of Innsbruck, Technikerstr. 25, 6020, Innsbruck, Austria. , (Austria)
  • 2 Department of Life Sciences, The Natural History Museum, Cromwell Road, London, SW7 5BD, United Kingdom. , (United Kingdom)
  • 3 Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, The Nothe, Weymouth, DT4 8UB, United Kingdom. , (United Kingdom)
Type
Published Article
Journal
The Journal of eukaryotic microbiology
Publication Date
Nov 01, 2020
Volume
67
Issue
6
Pages
648–659
Identifiers
DOI: 10.1111/jeu.12817
PMID: 32654223
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Phytomyxea (phytomyxids) is a group of obligate biotrophic pathogens belonging to the Rhizaria. Some phytomyxids are well studied and include known plant pathogens such as Plasmodiophora brassicae, the causal agent of clubroot disease. Despite this economic importance, the taxonomy and biodiversity of this group are largely cryptic, with many species described in the premolecular area. Some of these species were key for establishing the morphotaxonomic concepts that define most genera to this day, but systematic efforts to include and integrate those species into molecular studies are still lacking. The aim of this study was to expand our understanding of phytomyxid biodiversity in terrestrial environments. Thirty-eight environmental samples from habitats in which novel and known diversity of Phytomyxea was expected were analysed. We were able to generate 18S rRNA sequences from Ligniera verrucosa, a species which is well defined based on ultrastructure. Phylogenetic analyses of the collected sequences rendered the genera Lignera, Plasmodiophora and Spongospora polyphyletic, and identified two novel and apparently diverse lineages (clade 17, clade 18). Based on these findings and on data from previous studies, we formally establish the new genera Pseudoligniera n. gen. for L. verrucosa,Hillenburgia n. gen. for Spongospora nasturtii and revert Plasmodiophora diplantherae to its original name Ostenfeldiella diplantherae. © 2020 The Authors. Journal of Eukaryotic Microbiology published by Wiley Periodicals LLC on behalf of International Society of Protistologists.

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