title: Yamadazyma siamensis sp. nov., Yamadazyma phyllophila sp. nov. and Yamadazyma paraphyllophila sp. nov., three novel yeast species isolated from phylloplane in Thailand and Taiwan.
abstract: Four strains representing three novel anamorphic yeast species were isolated from the external surface of sugarcane leaves (DMKU-RK254(T)), corn leaves (DMKU-RK548(T)), bean leaves (K129) in Thailand and hengchun pencilwood leaves (TrB1-1(T)) in Taiwan. On the basis of morphological, biochemical, physiological and chemotaxonomic characteristics, the sequence analysis of the D1/D2 region of the large subunit (LSU) rRNA gene, the internal transcribed spacer (ITS) region, the actin gene (ACT1) and the elongation factor 2 gene (EF2), the four strains were determined to represent novel Yamadazyma species although formation of ascospores was not observed. Strain DMKU-RK254(T) was determined to be related to Candida diddensiae, Candida naeodendra and Candida kanchanaburiensis but with 1.8, 1.8 and 2.0 % nucleotide substitutions in the D1/D2 region of the LSU rRNA gene, respectively. It was assigned to Yamadazyma siamensis sp. nov. (type strain DMKU-RK254(T) = BCC 50730(T) = NBRC 108901(T) = CBS 12573(T)). The sequences of the D1/D2 region of the LSU rRNA gene, the ITS region, ACT1 gene and EF2 gene of two strains (DMKU-RK548(T) and K129) were identical but differed from that of strain TrB1-1(T) by 0.6, 1.0, 3.3 and 5.9 % nucleotide substitutions, respectively. Therefore, the two strains (DMKU-RK548(T) and K129) and strain TrB1-1(T) were assigned to be two separate species. The closest species in terms of pairwise sequences similarity of the D1/D2 region to the two novel species was Yamadazyma philogaea but with 1.1-1.7 % nucleotide substitutions. The two strains (DMKU-RK548(T) and K129) were assigned to Yamadazyma phyllophila sp. nov. (type strain DMKU-RK548(T) = BCC 50736(T) = NBRC 108906(T) = CBS 12572(T)) and the strain TrB1-1(T) was named Yamadazyma paraphyllophila sp. nov. (type strain TrB1-1(T) = BCRC 23030(T) = CCTCC AY 204005(T) = CBS 9928(T)).
authors.affiliation: Department of Microbiology, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand.
authors.forename: Rungluk
authors.initials: R
authors.lastname: Kaewwichian
authors.forename: Wichien
authors.initials: W
authors.lastname: Yongmanitchai
authors.forename: Hiroko
authors.initials: H
authors.lastname: Kawasaki
authors.forename: Pi-Han
authors.initials: PH
authors.lastname: Wang
authors.forename: Shan-Hua
authors.initials: SH
authors.lastname: Yang
authors.forename: Savitree
authors.initials: S
authors.lastname: Limtong
mesh_terms: D016000:Cluster Analysis; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D007887:Fabaceae / Q000382:microbiology; D020459:Genes, rRNA; D008969:Molecular Sequence Data; D016533:Mycological Typing Techniques; D010802:Phylogeny; D018515:Plant Leaves / Q000382:microbiology*; D012331:RNA, Fungal / Q000235:genetics; D012335:RNA, Ribosomal / Q000235:genetics; D004718:Saccharomycetales / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification* / Q000502:physiology; D031786:Saccharum / Q000382:microbiology; D017422:Sequence Analysis, DNA; D013624:Taiwan; D013785:Thailand; D003313:Zea mays / Q000382:microbiology
chemical_list: D004271:DNA, Fungal; D004275:DNA, Ribosomal; D012331:RNA, Fungal; D012335:RNA, Ribosomal; C065096:RNA, ribosomal, 26S