| 摘要 |
PROBLEM TO BE SOLVED: To provide a mutant strain of yellow Koji mold which has less accompanying mutation and could not be obtained by a conventional mutation method, e.g. a Koji mold having protease productivity of≥1,100 U/g Koji and glutaminase productivity of≥2.0 U/g Koji, and to provide a gene-deficient mutant strain (pyrG mutant strain) etc. SOLUTION: The yellow Koji mold such as Aspergillus soya and Aspergillus oryzae is irradiated with a heavy ion beam and the yellow Koji mold causing a mutation is selected from among the irradiated material and a cultured product thereof to thereby afford the mutant strain of the yellow Koji mold having desired microbiological characteristics. COPYRIGHT: (C)2009,JPO&INPIT
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