Pichia garciniae sp. nov., isolated from a rotten mangosteen fruit (Garcinia mangostana L., Clusiaceae)

Abstract

Ascogenous yeasts were isolated from a decaying mangosteen fruit (Garcinia mangostana L., Clusiaceae). Based on colony morphology and RAPD analysis, the strains were grouped into four groups (G-I, G-II, G-III and G-IV). Phenotypic properties and analysis of the D1/D2 domain sequence of the 26S rRNA gene identified representative members of groups G-II, G-III and G-IV as Pichia manshurica (=Pichia galeiformis), Pichia fermentans and Pichia anomala, respectively. Representatives of group G-I, YS110(T) and YS111, showed similar phenotypic traits, 99.9 % similarity in the sequence of the D1/D2 domain of the 26S rRNA gene and ITS1-5.8S rRNA gene-ITS2 sequence and 92 % DNA-DNA relatedness. Hence, YS110(T) and YS111 are regarded as members of the same species. Based on D1/D2 domain and ITS region sequences, the nearest phylogenetic neighbours of YS110(T) and YS111 were identified as Pichia membranifaciens and P. manshurica. However, YS110(T) differs from these two nearest phylogenetic neighbours by >3 % in the D1/D2 domain sequence and by >18 % with respect to the ITS region sequence. In addition, YS110(T) and YS111 differ from P. membranifaciens NRRL Y-2026(T) and P. manshurica NRRL Y-27978(T) with respect to a number of phenotypic traits. The strains show 52-57 % DNA-DNA relatedness with P. membranifaciens NRRL Y-2026(T) and P. manshurica NRRL Y-27978(T). Strains YS110(T) and YS111 are proposed as two strains of a novel species, for which the name Pichia garciniae sp. nov. is proposed. The type strain is YS110(T) (=NRRL Y-48422(T) =CBS 10758(T)).