Počet záznamů: 1  

Olisthodiscus represents a new class of Ochrophyta

  1. 1.
    0557215 - BC 2022 RIV US eng J - Článek v odborném periodiku
    Barcyté, D. - Eikrem, W. - Engesmo, A. - Seoane, S. - Wohlmann, J. - Horák, Aleš - Yurchenko, T. - Eliáš, M.
    Olisthodiscus represents a new class of Ochrophyta.
    Journal of Phycology. Roč. 57, č. 4 (2021), s. 1094-1118. ISSN 0022-3646. E-ISSN 1529-8817
    Grant CEP: GA MŠMT(CZ) EF16_019/0000759; GA ČR(CZ) GA18-13458S; GA MŠMT(CZ) LM2018129; GA MŠMT(CZ) EF16_013/0001775
    Institucionální podpora: RVO:60077344
    Klíčová slova: morphology * Ochrophyta * Olisthodiscus * phylogeny * pigments * plastid genome * Raphidophyceae * rDNA * SulT * taxonomy
    Obor OECD: Cell biology
    Impakt faktor: 3.173, rok: 2021
    Způsob publikování: Omezený přístup
    https://onlinelibrary.wiley.com/doi/10.1111/jpy.13155

    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.
    Trvalý link: https://hdl.handle.net/11104/0332625

     
     
Počet záznamů: 1  

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