Olisthodiscus represents a new class of Ochrophyta
© 2021 Phycological Society of America.
| Veröffentlicht in: | Journal of phycology. - 1966. - 57(2021), 4 vom: 02. Aug., Seite 1094-1118 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2021
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| Zugriff auf das übergeordnete Werk: | Journal of phycology |
| Schlagworte: | Journal Article Research Support, Non-U.S. Gov't Olisthodiscus Ochrophyta Raphidophyceae SulT morphology phylogeny pigments plastid genome mehr... |
| Zusammenfassung: | © 2021 Phycological Society of America. The phylogenetic diversity of Ochrophyta, a diverse and ecologically important radiation of algae, is still incompletely understood even at the level of the principal lineages. One taxon that has eluded simple classification is the marine flagellate genus Olisthodiscus. We investigated Olisthodiscus luteus K-0444 and documented its morphological and genetic differences from the NIES-15 strain, which we described as Olisthodiscus tomasii sp. nov. Phylogenetic analyses of combined 18S and 28S rRNA sequences confirmed that Olisthodiscus constitutes a separate, deep, ochrophyte lineage, but its position could not be resolved. To overcome this problem, we sequenced the plastid genome of O. luteus K-0444 and used the new data in multigene phylogenetic analyses, which suggested that Olisthodiscus is a sister lineage of the class Pinguiophyceae within a broader clade additionally including Chrysophyceae, Synchromophyceae, and Eustigmatophyceae. Surprisingly, the Olisthodiscus plastid genome contained three genes, ycf80, cysT, and cysW, inherited from the rhodophyte ancestor of the ochrophyte plastid yet lost from all other ochrophyte groups studied so far. Combined with nuclear genes for CysA and Sbp proteins, Olisthodiscus is the only known ochrophyte possessing a plastidial sulfate transporter SulT. In addition, the finding of a cemA gene in the Olisthodiscus plastid genome and an updated phylogenetic analysis ruled out the previously proposed hypothesis invoking horizontal cemA transfer from a green algal plastid into Synurales. Altogether, Olisthodiscus clearly represents a novel phylogenetically distinct ochrophyte lineage, which we have proposed as a new class, Olisthodiscophyceae |
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| Beschreibung: | Date Completed 22.10.2021 Date Revised 22.10.2021 published: Print-Electronic RefSeq: NC_004799.1, KJ569775.1, NC_024665.1, M24288.1, X15768.1, M82860.1, AF086950.1, AF157380.1, AF210743.1, AF112992.1, AY788937.1, DQ065612.1, AY864022.1, AB280605.1, AB459521.1, AB459522.1, KP780272.1, MT859097.1, MW045617.1, MW052523.1, MW052524.1, MT497912.1, MT497913.1, MW045558.1, MW045538.1, KP404867.1, AY180021.1, NC_000926.1, KP780272 Citation Status MEDLINE |
| ISSN: | 1529-8817 |
| DOI: | 10.1111/jpy.13155 |