Isolation of Wild Yeasts from Soils of Reed Fields in Seocheon-gun County, Chungcheongnam-do, South Korea, and Characterization of Unrecorded Yeasts

Sang-Min Han1   Sang-Yeop  Lee1,*    Hyang-Burm  Lee2    Jong-Soo  Lee1   

1Department of Biomedicinal Science and Biotechnology, Paichai University
2Environmental Microbiology Lab, Division of Food Technology, Biotechnology & Agrochemistry, College of Agriculture and Life Sciences, Chonnam National University,Yongbong-Dong 300, Buk-Gu, Gwangju 61186, Korea

Abstract

The goal of this study was to isolate wild yeasts from reed fields in the Seocheon-gun county in Chungcheongnam-do, South Korea. Molecular analysis of the D1/D2 domain of the 26S rDNA of the yeasts isolated from soil samples was performed using Basic Local Alignment Search Tool (BLAST). In total, 20 yeast strains from 11 species were isolated from 20 different soil samples. Candida species were observed to be the most common yeasts. Of these 20 strains, Candida subhashii (6 strains), Candida tropicalis (3 strains), Candida boleticola MS008, and Lachancea thermotolerans (2 strains) were identified as alcohol-fermenting yeasts. Further, Bullera japonica YJ10-1, Candida subhashii J7-1, Kluyveromyces yarrowii YJ11-1, and Ustilago shanxiensis Y10-1 were newly recorded yeast strains in Korea, and therefore, their microbiological characteristics were investigated further. All of these unrecorded yeast strains had oval cells; only Candida subhashii J7-1 formed ascospores and pseudomycelia. Kluyveromyces yarrowii YJ11-1 grew in vitamin-free medium, and all of these strains, except Candida subhashii J7-1, grew in 5% NaCl-containing YPD broth.

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