Authors: Wang, Qi-Ming; Bai, Feng-Yan

Source: FEMS Yeast Research, Volume 8, Number 5, August 2008 , pp. 799-814(16)

Publisher: Wiley-Blackwell

Abstract:

Phylogenetic relationships among the hymenomycetous yeasts in the Cryptococcus luteolus lineage of the Tremellales were examined based on sequence analyses of the 18S rRNA gene, 26S rRNA gene D1/D2 domain, internal transcribed spacer (ITS) region including 5.8S rRNA gene and mitochondrial cytochrome b gene. In addition to the Dioszegia clade, two clades represented by Bullera mrakii and Bullera sinensis, respectively, were revealed to be well-separated monophyletic groups in the lineage. These clades also exhibited distinguishable colony characters. Two new genera, Derxomyces gen. nov. (type species: Derxomyces mrakii comb. nov.) and Hannaella gen. nov. (type species: Hannaella sinensis comb. nov.), are proposed to accommodate the species in the B. mrakii and B. sinensis clades, respectively. Mainly based on D1/D2 and ITS sequence comparison, eight novel Derxomyces species were recognized from ballistoconidium-forming strains isolated from plant leaves. The new species and their type strains are as follows: Derxomyces boekhoutii (AS 2.3758^T=CBS 10824^T), Derxomyces hainanensis (AS 2.3467^T=CBS 10820^T), Derxomyces linzhiensis (AS 2.2668^T=CBS 10827^T), Derxomyces pseudocylindrica (AS 2.3778^T=CBS 10826^T), Derxomyces qinlingensis (AS 2.2446^T=CBS 10818^T), Derxomyces simaoensis (AS 2.3571^T=CBS 10822^T), Derxomyces wuzhishanensis (AS 2.3760^T=CBS 10825^T) and Derxomyces yunnanensis (AS 2.3562^T=CBS 10821^T).

Keywords: basidiomycetous yeasts; Tremellales; Bullera; Derxomyces; Hannaella; molecular phylogeny

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1567-1364.2008.00403.x

Affiliations: 1: Systematic Mycology and Lichenology Laboratory, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China

Publication date: 2008-08-01

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