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Phytopythium: molecular phylogeny and systematics.

A W A M de Cock1, A M Lodhi2, T L Rintoul3

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

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Summary
This summary is machine-generated.

This study confirms Pythium clade K members belong to the genus Phytopythium using molecular data. Phytopythium is now phylogenetically and morphologically distinct from Pythium and Phytophthora.

Keywords:
COILSUOomycetesOomycotaPeronosporalesPhytopythiumPythialesSSU

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Area of Science:

  • Mycology
  • Plant Pathology
  • Phylogenetics

Background:

  • The genus Phytopythium, belonging to the order Peronosporales, requires a complete circumscription.
  • Previous classifications have not definitively placed members of Pythium clade K within Phytopythium.

Purpose of the Study:

  • To provide molecular evidence for the inclusion of Pythium clade K within the genus Phytopythium.
  • To establish Phytopythium as a distinct phylogenetic entity.
  • To formally transfer and describe species within Phytopythium.

Main Methods:

  • Phylogenetic analyses using nuclear ribosomal DNA (LSU and SSU) and mitochondrial DNA (COI).
  • Maximum likelihood and Bayesian inference methods were employed.
  • Statistical analyses of pairwise distances were conducted.

Main Results:

  • Molecular data strongly support the placement of Pythium clade K members within Phytopythium.
  • Phytopythium exhibits unique morphological characteristics, including papillate, internally proliferating sporangia and distinct antheridia.
  • Phytopythium is morphologically intermediate between Phytophthora and Pythium.

Conclusions:

  • Phytopythium is a phylogenetically and morphologically distinct genus.
  • Formal transfer of Pythium clade K species to Phytopythium is supported.
  • A new species, Phytopythium mirpurense, is described.