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    • 2. 发明专利
    • PRODUCTION OF MONOPLOID STRAIN OF YEAST
    • JPH0937769A
    • 1997-02-10
    • JP21302695
    • 1995-07-31
    • GEKKEIKAN KK
    • TSUTSUMI HIROKOMINAZU TETSUYOSHIKAWATO SHOJISUGINAMI KOJIIMAYASU SATOSHI
    • C12N1/16
    • PROBLEM TO BE SOLVED: To readily and accurately isolate a monoploid strain of a practical yeast without using an experimental system comprising a great number of nutrient cells as a conventional method by selecting a variant having a high spore formation ratio from a parent strain. SOLUTION: A variant having a high spore formation ratio is selected from a parent strain. The selection of the variant is preferably carried out by using at least one of ethionine sensitivity, growth in a β-alanine medium at 35 deg.C and a constituent type acidic phosphatase activity as an index. A variant having ethionine sensitivity, for example, is obtained by culturing a yeast in a YPD medium, varying the yeast by irradiation with X rays, then culturing the variant in an SD medium containing 1mM ethionine, adding nystatin, continuing the culture to destroy an ethionine-resistant strain and further selecting a strain excellent in spore formation ratio from the living yeast. A monoploid strain of yeast, for example, is obtained by culturing a variant in a spore forming medium, dissolving an Ascus wall of the prepared Ascus, separating a single spore and culturing the spore.