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Induction of Mutation in Streptococcus diacetilactis by Nitrosoguanidine and Ultraviolet Irradiation¹

National Dairy Research Institute, Karnal, India

ABSTRACT

A culture of Streptococcus diacetilactis (DRC₃) was exposed to the mutagenic action of N-methyl-N'-nitro-N-nitrosognanidine and ultraviolet irradiation, singly and in combination. There was considerable variation in total acidity and production of flavor compounds for cultures, irrespective of the mutagenic treatment, indicating possible genetic changes in exposed cells. An average of 0.3% titratable acidity was obtained for mutants in contrast to 0.45% for the untreated culture. Eight mutants obtained after combined treatment produced higher amounts of diacetyl. One of the mutants (M₁) did not coagulate milk up to 48 hours compared to the performance of other isolates and the parent culture. The capacity to produce acid was partially impaired in this mutant strain. There were no significant differences between it and the parent culture in production of volatile acidity, diacetyl, acetoin, and proteolytic activity. However, mutant strain M₁ produced nearly double the amount of acetaldehyde.

¹ National Dairy Research Institute Publication 70–58.

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