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Stemphylium revisited.

J H C Woudenberg1, B Hanse2, G C M van Leeuwen3

  • 1Westerdijk Fungal Biodiversity Institute, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands.

Studies in Mycology
|July 1, 2017
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Summary
This summary is machine-generated.

A 2007 sugar beet disease outbreak prompted a revision of the Stemphylium genus. Researchers established a new multi-gene phylogeny, identifying five new species and clarifying the taxonomy of Stemphylium leaf spot pathogens.

Keywords:
Alternaria lancipes Ellis & Everh.MorphologyMulti-gene phylogenyPleosporaPleospora pomorum A.S. HorneS. canadense Woudenb. & CrousS. chrysanthemicola Woudenb. & CrousS. halophilum (J. Webster) Woudenb. & CrousS. lucomagnoense Woudenb. & CrousS. novae-zelandiae Woudenb. & CrousS. simmonsii Woudenb. & CrousStemphylium armeriae (Corda) Woudenb. & CrousStemphylium solani G.F. WeberThyrospora astragali YoshiiThyrospora lycopersici Enjoji

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Area of Science:

  • Plant Pathology
  • Mycology
  • Systematic Botany

Background:

  • A novel Stemphylium leaf spot disease significantly impacted sugar beet (Beta vulgaris) in the Netherlands starting in 2007.
  • Previous taxonomic classifications of Stemphylium and its sexual morph, Pleospora, were found to be polyphyletic, necessitating a revision.

Purpose of the Study:

  • To conduct a comprehensive phylogenetic revision of the fungal genus Stemphylium.
  • To establish a robust, multi-gene phylogeny for Stemphylium, clarifying species boundaries and taxonomy.
  • To identify the causal agent of the destructive Stemphylium leaf spot disease in sugar beet.

Main Methods:

  • Sequencing of the internal transcribed spacer (ITS) region and 5.8S nr DNA from 418 CBS culture collection isolates and 23 new isolates.
  • Further phylogenetic analysis using parts of the calmodulin and glyceraldehyde-3-phosphate dehydrogenase genes for 149 isolates.
  • Morphological characterization of new species and taxonomic revisions, including synonymizations and new combinations.

Main Results:

  • A multi-gene phylogeny revealed 28 species-clades within Stemphylium, including five newly identified species.
  • The majority of sugar beet isolates, from various European countries, clustered within a clade identified as S. beticola.
  • Twenty-two existing names were synonymized, two new combinations were proposed, and type specimens were designated to stabilize taxonomy.

Conclusions:

  • The study provides a well-supported, multi-gene phylogeny for the genus Stemphylium, resolving long-standing taxonomic issues.
  • S. beticola is confirmed as a significant pathogen of sugar beet, with implications for disease management.
  • The revised taxonomy and designation of type specimens establish a uniform and stable classification for Stemphylium species.