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Three novel species of d-xylose-assimilating yeasts, Barnettozyma xylosiphila sp. nov., Barnettozyma xylosica sp. nov. and Wickerhamomyces xylosivorus f.a., sp. nov.
This study describes three novel xylose-assimilating yeasts which were isolated from decayed wood collected from Bung Hatta Botanical Garden in West Sumatra and Cibodas Botanic Garden in West Java or from litter from Eka Karya Bali Botanic Garden in Bali Indonesia. Phylogenetic analysis was performed based on the sequences of the D1/D2 domains of the large ribosomal subunit (LSU) the small ribosomal subunit (SSU) the internal transcribed spacer (ITS) and elongation factor-1α (EF-1α) and the three strains were found to represent three novel species belonging to genera Barnettozyma or Wickerhamomyces. The morphological biochemical and physiological characteristics indicated that the strains were distinct from other closely related species. Strains 13Y206T and 14Y196T belonging to the Barnettozyma clade are described as the type strains of Barnettozyma xylosiphila sp. nov. (type strain 13Y206T=NBRC 110202T=InaCC Y726T; MycoBank MB808598) and Barnettozyma xylosica sp. nov. (type strain 14Y196T=NBRC 111558T=InaCC Y1030T; MycoBank MB819485). Strain 14Y125T belonging to the Wickerhamomyces clade is described as the type strain of Wickerhamomyces xylosivorus f.a. sp. nov. (type strain 14Y125T=NBRC 111553T=InaCC Y1026T; MycoBank MB819484).
Barnettozyma menglunensis f.a., sp. nov., a novel yeast species isolated from rotting wood
A novel yeast species is described based on three strains isolated from rotting wood samples from Xishuangbanna Tropical Rainforest in Yunnan Province PR China. Strain NYNU 1811121 was isolated in Menglun Mengla while strains NYNU 18982 and NYNU 181096 were recovered in Mengyang Jinghong. Analysis of the sequences of the D1/D2 domain of the large subunit rRNA gene and the internal transcribed spacer (ITS) region (ITS1-5.8S–ITS2) revealed that the novel strains were closely related to the type strain of [Candida] sanyiensis but with 6.9 % nucleotide substitutions in the D1/D2 domain and 8.2 % substitutions in the ITS region. The three novel strains can also be distinguished from C. sanyiensis in terms of the ability to assimilate trehalose and d-gluconate and to grow at 35 °C as well as the inability to ferment glucose. Based on molecular analyses and phenotypic characteristics the name Barnettozyma menglunensis f.a. sp. nov. is proposed with the holotype CBS 16011T (MycoBank 845375).