麹菌の変異に關する研究 (第6報) : B. 自然変異について (2)

概要

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For the purpose of obtaining a clue to find out whether the presence or absence of vitamins and other minute constituents is concerned in the occurrence of the natural variation in continued subcultures of Asp. oryzae, we observed continuosly the change of the morphological characteristics and the enzymic power in these subcultures on various agar media. The agar media were prepared by adding the extracts of various materials, viz., carrot, dry yeast, indian corn, rice-bran, kome-koji, wheat-bran, rootlet of malt, defatted soy bean, potato or soil, to CZAPEK'S agar as basal medium. In continued subcultures, the occurrence of teratologic forms tended slightly to increase and was especially notable in the case of addition of soil extract. Maltrrotlet extract or carrot extract exerted relatively good effect on the conidia formation, but soil extract considerably worse effect. In continued subculture starch liquefying power showed a tendency to decrease, particularly in the case of addition of carrot or soil extract. Even in continued subculture, however, starch saccharifying power varied scarcely and the difference in effect through the addition of various extracts was hardly recognizable.
社団法人日本生物工学会の論文
1954-04-15