A diversity study of Saccharomycopsis fibuligera in rice wine starter nuruk, reveals the evolutionary process associated with its interspecies hybrid

Mohamed El-Agamy Farh; Yunjoo Cho; Jae Yun Lim; Jeong-Ah Seo

doi:10.1007/s12275-017-7115-y

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A diversity study of Saccharomycopsis fibuligera in rice wine starter nuruk, reveals the evolutionary process associated with its interspecies hybrid: Mohamed El-Agamy Farh , Yunjoo Cho , Jae Yun Lim , Jeong-Ah Seo; Journal of Microbiology 2017;55(5):337-343.
DOI: https://doi.org/10.1007/s12275-017-7115-y
Published online: April 29, 2017

School of Systems Biomedical Science, Soongsil University, Seoul 06978, Republic of KoreaSchool of Systems Biomedical Science, Soongsil University, Seoul 06978, Republic of Korea

Corresponding author: Jeong-Ah Seo , Tel: +82-2-820-0449,

Received: 20 March 2017 • Accepted: 25 March 2017

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Abstract

The amylolytic yeast Saccharomycopsis fibuligera is the pre-dominant yeast in the starter product, nuruk, which is utilized for rice wine production in South Korea. Latest molecular studies explore a recently developed interspecific hybridiza-tion among stains of S. fibuligera with a unique genetic fea-ture. However, the origin of the natural hybridization occur-rence is still unclear. Thus, to respectively distinguish paren-tal and hybrid strains, specific primer sets were applied on 141 yeast strains isolated from different nuruk samples fer-mented in different provinces. Sixty-seven strains were de-fined accordingly as parental species with genome A while 8 strains were defined as hybrid strains. Unexpectedly, another parental species with genome B could not be found among the strain pools yet. Furthermore, it was observed that hybrid strains are phenotypically different from A genome strains; asci containing tetrad ascospores were observed in A genome strains more frequent than in hybrid strains. Nevertheless, hybrid strains were slightly more thermotolerant than A ge-nome strains. Interestingly, all hybrid strains were located only in Jeju province. Based on these sets of data, we specu-lated that the unique climate of Jeju province might play an evolutionary role in the interspecific hybridization between A genome strains, as well as the unculturable allopatric B ge-nome strains.

Keywords: APL1;asci;Jeju;natural hybridization;nuruk;Sac-charomycopsis fibuligera;thermotolerant

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A diversity study of Saccharomycopsis fibuligera in rice wine starter nuruk, reveals the evolutionary process associated with its interspecies hybrid

J. Microbiol. 2017;55(5):337-343. Published online April 29, 2017

DOI: https://doi.org/10.1007/s12275-017-7115-y

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