Asexual and sexual morphs of Moesziomyces revisited

Article


Kruse, Julia, Doehlemann, Gunther, Kemen, Eric and Thines, Marco. 2017. "Asexual and sexual morphs of Moesziomyces revisited." IMA Fungus: the global mycological journal. 8 (1), pp. 117-129. https://doi.org/10.5598/imafungus.2017.08.01.09
Article Title

Asexual and sexual morphs of Moesziomyces revisited

ERA Journal ID123424
Article CategoryArticle
AuthorsKruse, Julia (Author), Doehlemann, Gunther (Author), Kemen, Eric (Author) and Thines, Marco (Author)
Journal TitleIMA Fungus: the global mycological journal
Journal Citation8 (1), pp. 117-129
Number of Pages13
Year2017
PublisherSpringer
Place of PublicationUnited States
ISSN2210-6340
2210-6359
Digital Object Identifier (DOI)https://doi.org/10.5598/imafungus.2017.08.01.09
Abstract

Yeasts of the now unused asexually typified genus Pseudozyma belong to the smut fungi (Ustilaginales) and are mostly believed to be apathogenic asexual yeasts derived from smut fungi that have lost pathogenicity on plants. However, phylogenetic studies have shown that most Pseudozyma species are phylogenetically close to smut fungi parasitic to plants, suggesting that some of the species might represent adventitious isolations of the yeast morph of otherwise plant pathogenic smut fungi. However, there are some species, such as Moesziomyces aphidis (syn. Pseudozyma aphidis) that are isolated throughout the world and sometimes are also found in clinical samples and do not have a known plant pathogenic sexual morph. In this study, it is revealed by phylogenetic investigations that isolates of the biocontrol agent Moesziomyces aphidis are interspersed with M. bullatus sexual lineages, suggesting conspecificity. This raises doubts regarding the apathogenic nature of asexual morphs previously placed in Pseudozyma, but suggests that there might also be pathogenic sexual morph counterparts for those species known only from asexual morphs. The finding that several additional species currently only known from their yeast morphs are embedded within the genus Moesziomyces, suggests that the yeast morph might play a more dominant role in this genus as compared to other genera of Ustilaginaceae. In addition, phylogenetic reconstructions demonstrated that Moesziomyces bullatus has a narrow host range and that some previously described but not widely used species names should be applied for Moesziomyces on other host genera than Echinochloa.

Keywordsecology; evolution; phylogeny; plant pathogens; pleomorphic fungi; Ustilaginomycotina; yeast
ANZSRC Field of Research 2020310407. Host-parasite interactions
310705. Mycology
Institution of OriginUniversity of Southern Queensland
Byline AffiliationsSenckenberg Biodiversity and Climate Research Centre, Germany
University of Cologne, Germany
Max Planck Society, Germany
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