Abstract
Eleven yeast strains representing two hitherto undescribed species were isolated from different kinds of meat samples in Hungary and one from the sediment of a tropical freshwater river in Southeastern Brazil. The analysis of the sequences of their large subunit rRNA gene D1/D2 domain and the internal transcribed spacer (ITS) regions placed the two new species in the Yarrowia clade. Some of the seven strains representing the first new species can mate and give rise to asci and form ascospores embedded in capsular material, which qualifies it as the third teleomorph species of the Yarrowia clade. The name Yarrowia porcina sp. nov. (type strain: NCAIM Y.02100T = CBS 12935T = NRRL Y-63669T, allotype strain UFMG-RD131A = CBS 12932A) is proposed for this new yeast species, which, based on physiological characters, is indistinguishable from Yarrowia lipolytica and some other species of the genus. Considerable intraspecific variability was detected among the sequences of the large subunit rRNA gene D1/D2 domains of the seven strains. The variability among the D1/D2 sequences exceeded the divergence observed among the ITS sequences and in some cases more than 1 % substitution among the D1/D2 sequences was detected. The conspecificity of these strains was supported by the low (0–3 substitutions) sequence divergence among their ITS sequences, the result of a parsimony network analysis utilizing the concatenated ITS and D1/D2 sequences and also by the fingerprint patterns generated by microsatellite primed PCR. No ascospore formation was observed in the group of the other five strains representing the second new species. These strains shared identical D1/D2 and ITS sequences. Yarrowia bubula f.a., sp. nov. (type strain: NCAIM Y.01998T = CBS 12934T = NRRL Y-63668T) is proposed to accommodate these strains.
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Acknowledgments
This study was partly supported by the State Secretariat for Higher Education, Hungarian Ministry of Human Resources and the Doctoral School of Food Sciences, Corvinus University of Budapest. This work was also funded by the Conselho Nacional de Desenvolvimento Cientifico e Tecnológico (CNPq – Brazil), Fundação do Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG), the Financiadora de Estudos e Projetos (FINEP, Brazil, process number 2084/07).
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Nagy, E., Dlauchy, D., Medeiros, A.O. et al. Yarrowia porcina sp. nov. and Yarrowia bubula f.a. sp. nov., two yeast species from meat and river sediment. Antonie van Leeuwenhoek 105, 697–707 (2014). https://doi.org/10.1007/s10482-014-0125-4
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DOI: https://doi.org/10.1007/s10482-014-0125-4