Asexual and sexual morphs of Moesziomyces revisited

Kruse, Julia and Doehlemann, Gunther and Kemen, Eric and Thines, Marco (2017) Asexual and sexual morphs of Moesziomyces revisited. IMA Fungus, 8 (1). pp. 117-129. ISSN 2210-6340

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made available under Non-commercial No derivative works Licence.
Faculty/School / Institute/Centre: Current - USQ Other
Date Deposited: 08 Apr 2019 05:50
Last Modified: 18 Apr 2019 02:08
Uncontrolled Keywords: ecology; evolution; phylogeny; plant pathogens; pleomorphic fungi; Ustilaginomycotina; yeast
Fields of Research : 06 Biological Sciences > 0603 Evolutionary Biology > 060307 Host-Parasite Interactions
06 Biological Sciences > 0605 Microbiology > 060505 Mycology
Identification Number or DOI: 10.5598/imafungus.2017.08.01.09
URI: http://eprints.usq.edu.au/id/eprint/36199

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