The phylogeny of strains of species of the genus Pichia Hansen (Saccharomycetaceae) based on the partial sequences of 18S ribosomal RNA: The proposals of Phaffomyces and Starmera, the new genera
1998
Yamada, Y. (Shizuoka Univ. (Japan). Faculty of Agriculture) | Higashi, T. | Ando, S. | Mikata, K.
Sixteen strains of Pichia and Saturnispora species were examined for their partial base sequences in positions 1451 through 1618, 168 bases, of 18S rRNA. Of the sixteen strains of Pichia and Saturnispora species examined, the strains of the four species, P. cactophila, P. fermentans, P. nakasei, and P. norvegensis were closely related phylogenetically to the type strain of P. membranaefaciens, the type species of the genus Pichia. The calculated number of base differences was 3-1. On the other hand, The strains of the six species. P. bovis, P. enphorbiae, P. onychis, P. pijperi, P. quercuum, and P. triangularis were closely related to the type strain of P. anomala (H. anomala, type species of genus Hansenula). The calculated number of base differences was 4-2. The strains of the only two species, P. angophorae and P. salictaria represented 13-5 base differences with the type strains of P. membranaefaciens and P. anomala. The type strain of Saturnispora saitoi had eight base differences, when compared with that of P. membranaefaciens. The type strains of P. amethionina, P. opuntiae, and P. thermotolerans, viz., the cactus yeast species, were phylogenetically quite distant: the base differences were 23-14 in P. amethionina, 31-28 in P. opuntiae, and 32-27 in P. thermotolerans. The type strain of P. amethionina had 40-29 base differences with those of P. opuntiae and P. thermotolerans. Between the type strains of P. opuntiae and P. thermotolerans, there were six base differences. Based on the sequence data obtained, the new genera Phaffomyces and Starmera were proposed for P. opuntiae and P. thermotolerans as well as P. amethionina, respectively
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