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Related Experiment Video

Updated: Apr 19, 2026

A Workflow for the Quantitative Assessment of the Endophytic and Epiphytic Bacterial Microbiomes of the Bark of Populus trichocarpa
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Resolving the polyphyletic nature of Pyricularia (Pyriculariaceae).

S Klaubauf1, D Tharreau2, E Fournier3

  • 1CBS-KNAW Fungal Biodiversity Centre, 3584 CT Utrecht, The Netherlands ; Fungal Molecular Physiology, Utrecht University, Utrecht, The Netherlands.

Studies in Mycology
|December 11, 2014
PubMed
Summary
This summary is machine-generated.

Phylogenetic analysis clarifies Pyricularia and Magnaporthe relationships, establishing new families Pyriculariaceae and Ophioceraceae. This research redefines fungal taxonomy based on DNA, not just morphology.

Keywords:
MagnaporthaceaeMagnaporthePhylogenyPyriculariaPyriculariaceaeSystematics

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Area of Science:

  • Mycology and Plant Pathology
  • Molecular Systematics
  • Fungal Taxonomy

Background:

  • Species of Pyricularia cause significant grass diseases, including rice blast disease (Pyricularia oryzae) and foliar diseases in wheat and millet.
  • Existing classifications of Magnaporthe-like fungi were challenged by differing spore morphologies and recent reallocations (e.g., Magnaporthe salvinii to Nakataea).
  • The need for a robust taxonomic framework for Pyricularia and related genera was evident, as traditional criteria like host range and conidium morphology proved insufficient.

Purpose of the Study:

  • To clarify the phylogenetic relationships among Pyricularia and Magnaporthe-like species using multi-gene DNA sequence data.
  • To establish a more accurate taxonomic classification for these economically important fungal pathogens.
  • To re-evaluate generic and species concepts within the Pyriculariaceae family.

Main Methods:

  • Phylogenetic analysis was conducted using partial DNA sequences from multiple genes (LSU, ITS, RPB1, actin, calmodulin).
  • Isolates were selected to represent a wide range of host plants and morphological types.
  • Morphological characteristics of conidia and conidiophores were documented and compared with phylogenetic data.

Main Results:

  • Species of Pyricularia sensu stricto form a monophyletic clade, defining the new family Pyriculariaceae, sister to the novel Ophioceraceae.
  • These families are distinct from the Magnaporthaceae, which includes Magnaporthiopsis and Nakataea.
  • The study identified 10 new genera and seven new species, proposing a revised classification based on integrated morphological and phylogenetic evidence. Host range and conidium morphology were found to be unreliable taxonomic markers alone.

Conclusions:

  • The phylogenetic framework supports the establishment of Pyriculariaceae and Ophioceraceae, resolving taxonomic ambiguities in Magnaporthe-like fungi.
  • Conidium morphology and host range are insufficient for generic-level classification, emphasizing the importance of molecular data.
  • The research provides a revised taxonomic understanding of Pyricularia and related genera, including the description of novel taxa.