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Mycosphaerella is polyphyletic.

P W Crous1, U Braun, J Z Groenewald

  • 1CBS Fungal Biodiversity Centre, P.O. Box 85167, 3508 AD, Utrecht, The Netherlands.

Studies in Mycology
|May 21, 2008
PubMed
Summary
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Phylogenetic analysis reveals Mycosphaerella is not a single genus. DNA sequencing reclassifies species, establishing new families like Teratosphaeriaceae and clarifying relationships within Mycosphaerellaceae.

Area of Science:

  • Mycology
  • Molecular Phylogenetics
  • Plant Pathology

Background:

  • Mycosphaerella is a large genus of ascomycetes with thousands of species.
  • Previous studies using ITS rDNA suggested Mycosphaerella was monophyletic.
  • The taxonomic status of numerous species and their anamorphs remained unclear.

Purpose of the Study:

  • To resolve the phylogenetic relationships within the Mycosphaerellaceae family.
  • To investigate the monophyly of the genus Mycosphaerella using LSU gene sequence data.
  • To re-evaluate the classification of leaf-spotting and extremotolerant species.

Main Methods:

  • DNA sequencing of the LSU gene.
  • Phylogenetic analyses to infer evolutionary relationships.
  • Comparative analysis of sequence data with existing taxonomic frameworks.

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Main Results:

  • LSU gene data indicate Mycosphaerellaceae is polyphyletic, comprising several distinct clades.
  • Several species, including important plant pathogens, are reclassified into the new genus Teratosphaeria and family Teratosphaeriaceae.
  • Distinct clades corresponding to Schizothyriaceae, Davidiellaceae, Capnodiaceae, and Mycosphaerellaceae were identified.
  • Most anamorph genera within the major clades are polyphyletic, requiring revised taxonomic concepts.

Conclusions:

  • The genus Mycosphaerella, as previously defined, is not monophyletic.
  • A new family, Teratosphaeriaceae, is established to accommodate several species.
  • The study necessitates a re-evaluation of anamorph genera and dual nomenclature within the Mycosphaerella complex.