Homothallism in Sugar-Tolerant Saccharomyces rouxii

概要

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Salt-tolerance and mating type of Saccharomyces rouxii isolated from marzipan and honey were examined; the most sugar-tolerant strains were tolerant of high NaCl concentrations such as 2.5 M, while one isolated from honey showed lower-tolerance and could not grow on medium containing more than 0.5 M NaCl. This suggests that the salt-tolerance is independent of the sugar-tolerance. However, the optimum concentration of NaCl for copulation and sporulation of the sugar-tolerant strains was 0.09-0.15 M. We constructed hybrids between sugar-tolerant and salt-tolerant strains, but genetic analysis of them was unsuccessful due to the sterility of the ascospores. Mating response and ploidy estimation of the sugar-tolerant strains indicated that they are essentially homothallic and one of them is diploid. This is the first evidence of the existence of diploid S. rouxii cells in natural habitats.
公益社団法人日本生物工学会の論文
1982-04-25