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An Easy and Flexible Inoculation Method for Accurately Assessing Powdery Mildew-Infection Phenotypes of Arabidopsis and Other Plants
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Conidial germination patterns in powdery mildews

R T A Cook1, U Braun

  • 130 Galtres Avenue, York YO31 1JT, UK. rtacook@hotmail.com <rtacook@hotmail.com>

Mycological Research
|July 31, 2009
PubMed

Insights

New conidial germination types for powdery mildew identification are proposed, improving taxonomic accuracy and aiding in distinguishing species like Neoerysiphe and Golovinomyces. This research refines the classification of Oidium anamorphs.

Area of Science:

  • Mycology
  • Plant Pathology
  • Taxonomy

Background:

  • Traditional conidial germination types (polygoni, cichoracearum, pannosa, fuliginea) are used for Oidium anamorph identification.
  • These established types inadequately distinguish all powdery mildew taxa and species.
  • Existing classifications do not fully encompass the diversity of observed germination patterns.

Purpose of the Study:

  • To propose new conidial germination types to improve the identification of Oidium anamorphs.
  • To refine the taxonomy of powdery mildews, including the genera Neoerysiphe and Golovinomyces.
  • To provide a key for identifying Oidium genera based on germination patterns.

Main Methods:

  • Analysis of germination tests and a comprehensive literature survey.
  • Proposal of new germination types: Striatoidium, Blumeria, and subtypes orthotubus and brevitubus.
  • Description of a special longitubus pattern for specific Erysiphe and Golovinomyces species.

Main Results:

  • Two new main types, Striatoidium and Blumeria, are proposed for Neoerysiphe and B. graminis, respectively.
  • New subtypes orthotubus and brevitubus are proposed for the pannosa and fuliginea types.
  • A longitubus pattern is described for Erysiphe trifolii and Golovinomyces sect. Depressi species.
  • The distinction between Striatoidium and Pseudoidium types aided in identifying simultaneous infections.
  • Golovinomyces sect. Depressi is re-described, including new combinations and a new species (G. sonchicola).

Conclusions:

  • The proposed conidial germination types enhance the taxonomic resolution of powdery mildews.
  • Revised classifications and new taxa improve the understanding of Oidium anamorph diversity.
  • The new key facilitates more accurate identification of Oidium genera.

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