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Diversity of Protists III01:27

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Published on: February 4, 2022

Phylogenetic lineages in Pseudocercospora.

P W Crous1, U Braun, G C Hunter

  • 1CBS-KNAW Fungal Biodiversity Centre, Uppsalalaan 8, 3584 CT, Utrecht, the Netherlands ; Microbiology, Department of Biology, Utrecht University, Padualaan 8, 3584 CH Utrecht, the Netherlands ; Wageningen University and Research Centre (WUR), Laboratory of Phytopathology, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands.

Studies in Mycology
|September 10, 2013
PubMed
Summary
This summary is machine-generated.

This study clarifies the fungal genus Pseudocercospora using molecular data, establishing 14 distinct clades and introducing new genera and species. Findings reveal significant host specificity, challenging previous taxonomic classifications.

Keywords:
CapnodialesCercosporaMulti-Locus Sequence Typing (MLST)MycosphaerellaMycosphaerellaceaeParacercosporaPseudocercosporellacercosporoidsystematics

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Area of Science:

  • Mycology
  • Plant Pathology
  • Molecular Systematics

Background:

  • Pseudocercospora is a widespread fungal genus causing plant diseases like leaf spots and blights.
  • Previously, it was often considered an anamorphic state of Mycosphaerella.
  • This study addresses the need for phylogenetic resolution within the Pseudocercospora complex.

Purpose of the Study:

  • To sequence the partial 28S nuclear ribosomal RNA gene of Pseudocercospora isolates.
  • To resolve phylogenetic generic limits within the Pseudocercospora complex.
  • To assess host specificity of Pseudocercospora species.

Main Methods:

  • Phylogenetic analysis using partial 28S nuclear ribosomal RNA gene sequences.
  • Sequencing of additional gene loci (ITS, EF-1α, ACT) for further phylogenetic insights.
  • Consideration of host specificity for 146 Pseudocercospora species across 115 host genera.

Main Results:

  • Fourteen distinct clades were identified within the Pseudocercospora complex.
  • New genera (Pallidocercospora, Phaeomycocentrospora) and numerous new species were described.
  • Phylogenetic data indicated that most Pseudocercospora species are host-specific, and geographical distribution impacts taxonomic naming.

Conclusions:

  • The study redefines the generic limits of Pseudocercospora and related taxa.
  • Molecular data support the host specificity of most Pseudocercospora species.
  • Taxonomic classifications should consider phylogenetic data over geographical or morphological similarities alone.