Four powdery mildew species with catenate conidia infect Galium: molecular and morphological evidence

Susumu Takamatsu1, Vasyl Heluta, Maria Havrylenko

  • 1Graduate School of Bioresources, Mie University, 1577 Kurima-Machiya, Tsu 514-8507, Japan. takamatu@bio.mie-u.ac.jp

Mycological Research
|October 22, 2008
PubMed

Insights

Powdery mildew fungi (Erysiphaceae) taxonomy is complex. This study reveals at least four distinct species infecting Galium plants, including a newly identified species, Golovinomyces calceolariae.

Area of Science:

  • Mycology
  • Plant Pathology
  • Fungal Taxonomy

Background:

  • Erysiphaceae fungi cause powdery mildew on angiosperms.
  • Traditional taxonomy relies on morphology due to culturing difficulties.
  • Previous classifications of Erysiphe galii have been revised, leading to new species and genera.

Purpose of the Study:

  • To evaluate the validity of the taxonomic revision of Erysiphe galii varieties.
  • To clarify the species diversity of powdery mildews on Galium spp.

Main Methods:

  • Morphological analysis of fungal specimens.
  • Comparison of Erysiphaceae species found on Galium plants.
  • Taxonomic description of a new fungal species.

Main Results:

  • The Galium powdery mildews comprise at least four species: Neoerysiphe galii, Golovinomyces orontii, Golovinomyces riedlianus, and a new species.
  • The new species, collected in Argentina, is described as Golovinomyces calceolariae.
  • Morphological differentiation among the three Golovinomyces species on Galium is challenging.

Conclusions:

  • The taxonomic revision of Erysiphe galii is supported by the findings.
  • Golovinomyces calceolariae represents a new addition to fungal diversity.
  • Further research is needed to refine morphological distinctions within the Golovinomyces genus affecting Galium.

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