Journal
ANTONIE VAN LEEUWENHOEK INTERNATIONAL JOURNAL OF GENERAL AND MOLECULAR MICROBIOLOGY
Volume 113, Issue 1, Pages 55-69Publisher
SPRINGER
DOI: 10.1007/s10482-019-01317-0
Keywords
Peat swamp forests; Thailand; Yeast diversity
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Khanthuli peat swamp forest (PSF) is one of a few fertile peat swamp forests that remain in Thailand. It is composed of primary PSF and some areas which have been degraded to secondary PSF due to drought, wildfires and land conversion, which have resulted in a decrease in peat layers and change in the species of the plant community. In this study, diversity of yeasts in peat from both primary and secondary PSF areas of the Khanthuli PSF was determined based on culture-dependent approaches, using dilution plate and enrichment techniques. A total of 66 yeast isolates were identified by the analysis of sequence similarity of the D1/D2 region of the large subunit rRNA gene or the combined analysis of sequence of the D1/D2 region and internal transcribed spacer region and confirmed by phylogenetic analysis of the D1/D2 region to belong to 22 known yeast species and six potential new species in the genera Candida (Kurtzmaniella, Lodderomyces, Ogataea, Pichia and Yamadazyma clades), Clavispora, Cyberlindnera, Galactomyces, Hanseniaspora, Metschnikowia, Saturnispora, Schwanniomyces, Cryptotrichosporon, Pichia, Curvibasidium, Papiliotrema, Rhodotorula, and Saitozyma. The most prevalent yeasts in the primary PSF were Cyberlindnera subsufficiens and Galactomyces candidus, while Saitozyma podzolica was the most frequently found in peat from the secondary PSF. Common yeast species in both, primary and secondary PSF, were Cy. subsufficiens, G. candidus and Rhodotorula mucilaginosa.
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