Multiple barcode assessment within the Saprolegnia-Achlya clade (Saprolegniales, Oomycota, Straminipila) brings order in a neglected group of pathogens

@article{Steciow2014MultipleBA,
  title={Multiple barcode assessment within the Saprolegnia-Achlya clade (Saprolegniales, Oomycota, Straminipila) brings order in a neglected group of pathogens},
  author={M{\'o}nica Mirta Steciow and Enrique Lara and Christopher Paul and Amandine Pillonel and Lass{\^a}ad Belbahri},
  journal={IMA Fungus},
  year={2014},
  volume={5},
  pages={439 - 448}
}
The Saprolegnia-Achlya clade comprises species of major environmental and economic importance due to their negative impact on aquaculture and aquatic ecosystems by threatening fishes, amphibians, and crustaceans. However, their taxonomy and phylogenetic relationships remain unresolved and suffer from many inconsistencies, which is a major obstacle to the widespread application of molecular barcoding to identify pathogenic strains with quarantine implications. We assessed phylogenetic… 

Figures from this paper

New phylogenetic insights into Saprolegniales (Oomycota, Straminipila) based upon studies of specimens isolated from Brazil and Argentina
TLDR
A concatenate phylogeny of the partial LSU and complete ITS rDNA regions is presented, including isolates from Brazil and Argentina, which were sequenced after a detailed morphological analysis and support the transference of Achlya androgyna to Newbya.
A revision of Salispina, its placement in a new family, Salispinaceae (Rhipidiales), and description of a fourth species, S. hoi sp. nov.
TLDR
The new family Salispinaceae is described to accommodate Salispina in the order Rhipidiales, which differs from all other known genera of the order in the weak formation of hyphal constrictions, and absence of basal thalli and a holdfast network.
Taxonomy and phylogeny of Aphanomycopsis bacillariacearum, a holocarpic oomycete parasitoid of the freshwater diatom genus Pinnularia
TLDR
Phylogenetic reconstruction shows that A. bacillariacearum from Pinnularia viridis is embedded within the Saprolegniales, and largely unrelated to both diatom-infecting oomycetes in the Leptomitales and those placed within the early-diverging lineages (Miracula, Diatomophthora of the Oomycota).
Notes on Dictyuchus species (Stramenopila, Oomycetes) from Anzali lagoon, Iran
TLDR
Nine Dictyuchus isolates obtained from floating and decaying twigs and leaves in Anzali lagoon are discussed about taxonomy of the genus in details and a revised key to the species was provided.
Distinct responses of oomycete plant parasites according to their lifestyle in a landscape-scale metabarcoding survey
TLDR
Overall both grassland and forest constitute an important reservoir of plant pathogens and relative abundances of obligate biotrophs and hemibiotrophs differed between regions and showed opposite responses to edaphic conditions and human-induced management intensification, suggesting different ecological requirements for these two functional guilds.
High-throughput sequencing reveals diverse oomycete communities in oligotrophic peat bog micro-habitat
Different community compositions between obligate and facultative oomycete plant parasites in a landscape-scale metabarcoding survey
TLDR
A baseline of the diversity and distribution of soil oomycetes, classified by lifestyles (biotrophy), at the landscape scale in temperate grassland and forest, is provided, suggesting different ecological requirements of these two lifestyles.
Neofunctionalization of Glycolytic Enzymes: An Evolutionary Route to Plant Parasitism in the Oomycete Phytophthora nicotianae
Oomycetes, of the genus Phytophthora, comprise of some of the most devastating plant pathogens. Parasitism of Phytophthora results from evolution from an autotrophic ancestor and adaptation to a wide
Phytophthora and Pythium Species Detected in Rivers of the Polish-Ukrainian Border Areas
There are many records in the literature demonstrating that species belonging to the genus Phytophthora and Pythium cause damage to fine root and trunk collars of many forest tree species. Natural
...
...

References

SHOWING 1-10 OF 37 REFERENCES
Taxonomic and phylogenetic analysis of Saprolegniaceae (Oomycetes) inferred from LSU rDNA and ITS sequence comparisons
TLDR
The achlyoid type of spore dehiscence, shared by Aphanomyces and Achlya genera, is shown to be an ancestral character and the saprolegnioid, dictyoid and thraustothecoid types of spores are derived characters but their relative evolutionary positions are not resolved.
Species boundaries within Saprolegnia (Saprolegniales, Oomycota) based on morphological and DNA sequence data
TLDR
Morphological analyses of all isolates revealed that each DNA-based clade could be delimited from others by autapomorphic or unique combinations of morphological character states but not without employing several features previously not used at the species level.
Incipient loss of flagella in the genus Geolegnia: the emergence of a new clade within Leptolegnia?
TLDR
It is shown that Geolegnia is nested within Leptolegnia, a genus characterised by its “conventional” biflagellate life cycle, and remains paraphyletic, awaiting the redefinition of genera in this complex.
Molecular phylogeny and taxonomy of the genus Pythium.
TLDR
Twenty-six species had ITS sequences identical or nearly identical to formerly described species, suggesting possible conspecificity and the importance of comparing ITS sequences of putative new species to the now available ITS database in order to avoid unwarranted new species names being introduced.
SSU rRNA reveals major trends in oomycete evolution
TLDR
A phylogeny of the whole clade based on the nuclear ribosomal small subunit gene is proposed, that comprises both culture and environmental studies derived sequences and will help to better understand the emergence of pathogenicity in the different oomycete groups.
DNA barcoding of oomycetes with cytochrome c oxidase subunit I and internal transcribed spacer
TLDR
The results described in this paper indicate that COI sequencing and the dataset generated are a valuable addition to the currently available oomycete taxonomy resources, and that both COI, the default DNA barcode supported by GenBank, and ITS, the de facto barcode accepted by the oomyCete and mycology community, are acceptable and complementary DNA barcodes to be used for identification of oomy cetes.
Molecular Identification and Hidden Diversity of Novel Daphnia Parasites from European Lakes
TLDR
Hidden diversity of parasite communities in Daphnia lake populations is revealed and a higher level of resolution for identifying parasite strains makes it possible to test new hypotheses with respect to parasite dispersal, transmission routes, and coinfection.
Revision of Aplanopsis , Pythiopsis , and ‘subcentric’ Achlya species ( Saprolegniaceae ) using 18S rDNA and morphological data
TLDR
Molecular data support morphologically based conclusions concerning the relatedness of Pythiopsis and Aplanopsis terrestris and the relationship of Calyptralegnia and Aplanes androgynus to Newbya is discussed.
Evolution of spore release mechanisms in the saprolegniaceae (Oomycetes): evidence from a phylogenetic analysis of internal transcribed spacer sequences
TLDR
A phylogenetic framework using internal transcribed spacer sequences of four genera shows Saprolegnia emerges as the most basal genus, sister to Achlya, Thraustotheca, and Dictyuchus and is consistent with the idea that the mechanism of sporangial emptying exhibited by SaproLegnia represents the plesiomorphic condition from which the other mechanisms were derived independently.
Saprolegnia oliviae sp. nov. isolated from an Argentine river (Tierra del Fuego Province, Argentina).
...
...