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Citation for Study 26426

About Citation title: "Stemphylium revisited".
About Study name: "Stemphylium revisited".
About This study is part of submission 26426 (Status: Published).

Citation

Woudenberg J.H., Hanse B., Van leeuwen G., Groenewald J.Z., & Crous P.W. 2017. Stemphylium revisited. Studies in Mycology, 87: 77103.

Authors

  • Woudenberg J.H.
  • Hanse B.
  • Van leeuwen G.
  • Groenewald J.Z. (submitter) Phone +31302122600
  • Crous P.W.

Abstract

In 2007 a new Stemphylium leaf spot disease of Beta vulgaris (sugar beet) spread through the Netherlands. Attempts to identify this destructive Stemphylium sp. in sugar beet led to a phylogenetic revision of the genus. The name Stemphylium has been recommended for use over that of its sexual morph, Pleospora, which is polyphyletic. Stemphylium forms a well-defined monophyletic genus in the Pleosporaceae, Pleosporales (Dothideomycetes), but lacks an up-to-date phylogeny. To address this issue, the internal transcribed spacer 1 and 2 and intervening 5.8S nr DNA (ITS) of all available Stemphylium and Pleospora isolates from the CBS culture collection of the Westerdijk Institute (N = 418), and from 23 freshly collected isolates obtained from sugar beet and related hosts, were sequenced to construct an overview phylogeny (N = 350). Based on their phylogenetic informativeness, parts of the protein-coding genes calmodulin and glyceraldehyde-3-phosphate dehydrogenase were also sequenced for a subset of isolates (N = 149). This resulted in a multi-gene phylogeny of the genus Stemphylium containing 28 species-clades, of which five were found to represent new species. The majority of the sugar beet isolates, including isolates from the Netherlands, Germany and the UK, clustered together in a species clade for which the name S. beticola was recently proposed. Morphological studies were performed to describe the new species. Twenty-two names were reduced to synonymy, and two new combinations proposed. Three epitypes, one lectotype and two neotypes were also designated in order to create a uniform taxonomy for Stemphylium.

Keywords

Morphology, Multi-gene phylogeny, Pleospora.

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  • Canonical resource URI: http://purl.org/phylo/treebase/phylows/study/TB2:S26426
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