title: Molecular phylogeny of basidiomycetous yeasts in the Cryptococcus luteolus lineage (Tremellales) based on nuclear rRNA and mitochondrial cytochrome b gene sequence analyses: proposal of Derxomyces gen. nov. and Hannaella gen. nov., and description of eight novel Derxomyces species.
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)).
authors.affiliation: Systematic Mycology and Lichenology Laboratory, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.
authors.forename: Qi-Ming
authors.initials: QM
authors.lastname: Wang
authors.forename: Feng-Yan
authors.initials: FY
authors.lastname: Bai
mesh_terms: D001487:Basidiomycota / Q000145:classification* / Q000166:cytology / Q000235:genetics* / Q000378:metabolism; D016000:Cluster Analysis; D045303:Cytochromes b / Q000235:genetics; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics*; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D021903:DNA, Ribosomal Spacer / Q000737:chemistry / Q000235:genetics; D005656:Fungal Proteins / Q000235:genetics; D008969:Molecular Sequence Data; D016533:Mycological Typing Techniques; D010802:Phylogeny; D012335:RNA, Ribosomal / Q000235:genetics; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D012340:RNA, Ribosomal, 5.8S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid
chemical_list: D004271:DNA, Fungal; D004275:DNA, Ribosomal; D021903:DNA, Ribosomal Spacer; D005656:Fungal Proteins; D012335:RNA, Ribosomal; D012337:RNA, Ribosomal, 18S; D012340:RNA, Ribosomal, 5.8S; C065096:RNA, ribosomal, 26S; D045303:Cytochromes b