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Appl Environ Microbiol. 1972 December; 24(6): 953-957
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Associative Growth Studies in Three-Strain Mixtures of Lactic Streptococci¹

^a Department of Food Technology, Iowa State University, Ames, Iowa 50010

ABSTRACT

A recently developed differential agar medium was used to study associative growth patterns in 17 different heterologous, three-strain mixtures of Streptococcus lactis, S. cremoris, and S. diacetilactis grown in milk. Mixtures were made by combining equal volumes of 18-hr milk cultures of the three species. Relative populations of component species were followed through three successive transfers in milk after the initial mixed propagation. Direct evidence for strain dominance and compatibility was obtained. A procedure also was developed to estimate the extent of suppression of S. lactis and S. diacetilactis in a mixture containing a dominant S. cremoris strain. The technique described could be successfully applied in quality-control work in the dairy-starter manufacturing industry.

² Present address: Department of Microbiology, Oregon State University, Corvallis, Ore. 97331.

³ Present address: Department of Biology, Southwestern Union College, Keene, Tex. 76059

¹ Journal Paper J-7274 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project 1838.