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Articulospora - Phylogeny vs morphology.

Sahadevan Seena1, Ludmila Marvanová2, Allan Letourneau3

  • 1MARE-Marine and Environmental Sciences Centre, University of Coimbra, PT-3004-517, Coimbra, Portugal.

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Summary
This summary is machine-generated.

Molecular analyses suggest retaining a broad concept for Articulospora tetracladia, acknowledging dimorphic conidia. The internal transcribed spacer (ITS) gene shows promise for aquatic hyphomycete taxonomy.

Keywords:
Aquatic hyphomycetesBarcodeCOX1D1/D2ITStaxonomy

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Area of Science:

  • Mycology
  • Fungal Taxonomy
  • Molecular Systematics

Background:

  • The taxonomy of aquatic hyphomycetes, including the genus Articulospora, traditionally relies on the morphology of their asexual reproductive structures (conidia).
  • Articulospora tetracladia, a globally distributed species, exhibits dimorphic conidia in natural populations, varying in branching levels, which complicates classification.
  • Previous classifications have been challenged by molecular data, necessitating a re-evaluation of species boundaries within Articulospora.

Purpose of the Study:

  • To investigate the phylogenetic relationships within the genus Articulospora using molecular data.
  • To assess the utility of different gene regions as DNA barcodes for differentiating Articulospora and related genera.
  • To clarify the taxonomic status of Articulospora tetracladia and the significance of conidial dimorphism.

Main Methods:

  • DNA extraction and amplification from 20 isolates of Articulospora and Fontanospora.
  • Sequencing of three gene regions: internal transcribed spacer (ITS), D1/D2 large subunit ribosomal DNA, and cytochrome c oxidase subunit I (COX1).
  • Phylogenetic analysis and comparison of sequence data to morphological observations.

Main Results:

  • Molecular analyses did not fully support species separation based solely on conidial branching patterns.
  • The internal transcribed spacer (ITS) region proved to be the most effective barcode, providing adequate resolution to distinguish between tested Articulospora and Fontanospora species.
  • D1/D2 primers showed amplification but limited resolution, while COX1 gene sequencing was inconsistent.

Conclusions:

  • A broad taxonomic concept for Articulospora tetracladia, encompassing strains with dimorphic conidia, is proposed.
  • The ITS gene region is recommended as a reliable molecular marker for the taxonomy of Articulospora and related aquatic hyphomycetes.
  • Molecular data integration is crucial for refining fungal taxonomy, especially for species with variable morphological characteristics.