麹菌の變異に關する研究 (第1報) : A誘發變異について (I)

概要

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By treating two selected strains of Aspergillus Oryzae, i. e. "2a" and "U Sake Shot, " with electric supersonic wave, we obtained many variants that were superior in some characters to the parent strain.The colonies of the variants deffer in color from those of the parent strain. The growth of the variants, except a few strains, is inferior to that of the parent strain and also the conidia formation generally talls belind, especially the conidia of one N type variant are hardly visible to the naked eye even after 72 hours culture at 30℃. Some abnormal or teratologic forms of vesicles and sterigmata are found in some variants, but they differ slightly from the parent strain in the form and size of the other parts of the thallus.The growth and the conidia formation of the variant "K_3" of "2" strain are more luxuriant than those of the parent strain, and the former exceds the latter in the protease activity, but in rspect of the amylase activity it is contary.The growth of the variants, "N_2" and "N_3", is good, but their ability of forming conidia falls off. It is remarkable that these variants are far superior in the amylase and protease activities to the parent strain.The variants of "U Sake Short" strain generally exceed the parent strain in the enzyme power.
公益社団法人日本生物工学会の論文
1952-03-15