Abstract
Strain DMKU-SP105T representing a novel yeast species was isolated from the external surface of a sugarcane leaf (Saccharum officinarum L.) collected from a sugarcane plantation field in Phichit province, Thailand. On the basis of sequence analysis of the D1/D2 region of the large subunit (LSU) rRNA gene and the internal transcribed spacer (ITS) region, the strain DMKU-SP105T differed by 7-16 substitutions in the D1/D2 region of LSU rRNA gene and 6-22 substitutions in the ITS region from a group of related species, Papiliotrema aspenensis, Papiliotrema odontotermitis, Papiliotrema rajasthanensis and Papiliotrema laurentii. A phylogenetic analysis based on the concatenated sequences of ITS region and the D1/D2 region of the LSU rRNA gene indicated that strain DMKU-SP105T belongs to the laurentii clade of Papiliotrema in the Tremellales and is distinct from other related species in the clade. It therefore represents a novel species of the genus Papiliotrema although the formation of basidiospores was not observed. The name Papiliotrema phichitensis f.a., sp. nov. is proposed. The type is DMKU-SP105T (= CBS 13390T = BCC 61187T = NBRC 109699T).
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