Journal of Microbiology

Journal Article

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; 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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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.

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Research Support, Non-U.S. Gov't

Characterization of a Baculovirus Newly Isolated from the Tea Slug Moth, Iragoidae fasciata: Li-Rong Yang , Xiao Qiang , Bao-Qin Zhang , Mei-Jun Tang , Chuan-Xi Zhang; J. Microbiol. 2009;47(2):208-213. Published online May 2, 2009; DOI: https://doi.org/10.1007/s12275-008-0253-5

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Abstract

The tea slug moth Iragoidae fasciata (Lepidoptera, Eucleidae) is one of the main insect pests that attack tea bushes. A new nucleopolyhedrovirus (NPV) called Iragoidae fasciata NPV (IrfaNPV) was recently isolated from diseased larvae. An 11,626 bp fragment of the viral genomic DNA containing the polyhedrin gene and other 12 genes was cloned and sequenced. Gene comparison and phylogenetic analysis showed that IrfaNPV is a member of the Group I NPVs. However, the genomic organization of IrfaNPV is highly distinct. In addition, electron microscopy analysis showed that IrfaNPV is a single nucleocapsid NPV (SNPV). An inoculation assay showed that IrfaNPV is semi-permissive in the Trichoplusia ni cell line Tn-5B1-4. Bioassays on lethal concentration (LC50) and lethal time (LT50) were conducted to test the susceptibility of I. fasciata larvae to the virus.

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