Introducing a new pathosystem for marine pathogens – the green alga Urospora neglecta and its pathogen Sirolpidium litorale sp. nov.

Buaya, Anthony T.; Tsai, Ichen; Klochkova, Tatyana A.; Thines, Marco

doi:10.1007/s11557-023-01938-w

Cited by 2 publications

(7 citation statements)

References 35 publications

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“…The different algorithms produced alignments of various lengths, with various numbers of variable (and parsimony-informative) sites and trees with different maximum-likelihoods (Table 1). All our analyses, as well as all previously published analyses (e.g., Buaya et al 2019, 2023b, Buaya and Thines 2020 concur that the four supported clades containing holocarpic red algal parasites do not cluster together (Fig. 2), so that grouping these lineages into any single genus or single order (Fig.…”

Section: Resultssupporting

confidence: 87%

“…Our investigation of the partial 18S sequences available for Pontisma lagenidioides and Sirolpidium bryopsidis (MK253530.2 and MW489460.1) further reveals that they are not identical over their entire length (818 bp) though conspecificity between both parasites was inferred because of "no genetic distance" between them (Buaya et al 2023b). The identifications of the organisms tismatales are not supported.…”

Section: Resultsmentioning

confidence: 82%

“…The nuclear encoded small subunit ribosomal 18S RNA gene (SSU) dataset was copied Buaya and Thines (2020) with added all recent sequences of holocarpic biotrophic algal parasites (e.g., Buaya et al 2023b) from GenBank. Several alignment methods were used, that all employ different algorithms and penalty scores: (1) Pagan using the Was@bi webserver (http://was.bi/) and default parameters (Löytynoja 2021); (2) PRANK alignment using the stand alone package also incorporating the default parameters (Löytynoja and Maximum-likelihood analyses were implemented using IQ-TREE 2 (Minh et al 2020) and Bayesian inference analysis with MrBayes v. 3.2 (Ronquist et al 2012).…”

Section: Methodsmentioning

confidence: 99%

“…Finally, a novel pathogen of a second green filamentous Ulotrichales, Urospora neglecta, which only showed olpidioid thalli and had a 18S sequence that was sister, though with only moderate bootstrap support, to the red algal parasite Olpidiopsis porphyrae. Having realized that Karling retained Sirolpidium over Pontisma, these authors now propose to assign all holocarpic, pathogens of red and green algae mentioned above to the genus Sirolpidium, within the monogeneric order Pontismatales (Buaya et al 2023b). As defined in the latter paper, this group also encompasses pathogens of diatoms and brown algae (Garvetto et al 2018, Buaya andThines 2022), as well as environmental sequences from uncharacterized organisms.…”

Section: Introductionmentioning

confidence: 99%

“…This body of work has led to repeated name changes to some important red algal pathogens twice over the past four years (Buaya et al 2019(Buaya et al , 2023b, though it was obvious from all these papers that this new circumscription of Pontisma (or lately, Sirolpidium) and the order Pontismatales was unsupported in any analyses (e.g., Badis et al 2019, Buaya et al 2019, 2021, 2023b, Buaya and Thines 2020. We decided to reinvestigate the phylogeny of this group based on the same data set of publicly available small subunit ribosomal DNA (SSU rDNA).…”

Section: Introductionmentioning

confidence: 99%

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Holocarpic oomycete parasites of red algae are not Olpidiopsis, but neither are they all Pontisma or Sirolpidium (Oomycota)

Zuccarello,

Gachon,

Badis

et al. 2024

Algae

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Oomycetes are ubiquitous heterotrophs of considerable economic and ecological importance. Lately their diversity in marine environments has been shown to be greatly underappreciated and many lineages of intracellular holocarpic parasites, infecting micro- and macro-algae, remain to be fully described taxonomically. Among them, pathogens of marine red algae have been studied extensively as they infect important seaweed crops. Throughout the 20th century, most intracellular, holocarpic biotrophic oomycetes that infect red algae have been assigned to the genus Olpidiopsis Cornu. However, 18S rRNA sequencing of Olpidiopsis saprolegniae, the species considered the generitype for Olpidiopsis, suggests that this genus is not closely related to the marine pathogens and that the latter requires a nomenclatural update. Here, we compile and reanalyze all recently published 18S rRNA sequence data for marine holocarpic oomycetes, with a particular focus on holocarpic pathogens of red algae. Their taxonomy has been revised twice over the past four years, with suggestions to transfer them first into the genus Pontisma and then Sirolpidium, and into a monogeneric order, Pontismatales. We show however, that previously published topologies and the proposed taxa Pontisma, Sirolpidium, and Pontismatales are unsupported. We highlight that name changes that are unfounded and premature create confusion in interested parties, especially concerning pathogens of marine red algae that infect important seaweed crops. We thus propose that the names of these holocarpic biotrophic parasites of red algae are retained temporarily, until a supported topology is produced with more genetic markers to enable the circumscription of species and higher-level taxa.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 82%