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Journal of Dairy Science Vol. 77 No. 3 689-695
© 1994 by American Dairy Science Association ®
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Exopolysaccharide Production by Streptococcus salivarius ssp. thermophilus Cultures. 2. Distinct Modes of Polymer Production and Degradation Among Clonal Variants

Frederique Gancel 1 and Georges Novel 2

1 Laboratoire de Génétique Microbienne, Institut de Recherche en Biologie Appliquée, Université de Caen, 14032 Caen Cedex. France
2 Laboratoire de Génétique Microbienne, Institut de Recherche en Biologie Appliquée, Université de Caen, 14032 Caen Cedex. France

A population of Streptococcus salivarius ssp. thermophilus S22 was clonally heterogeneous in polymer production and the mucoid character of colonies. Weak, moderate, or hyper-producing clones could be selected on selective medium showing that strain S22 was composed of cell types with different polymer production. Optimal polysaccharide production was induced either by lactose or by sucrose and required defined conditions of temperature and initial growth pH. In liquid medium, two degradative systems appeared to be active on short or mature polysaccharides. Environmental signals may trigger either of the two modes of production and degradation in the different types in the population.

Key Words: Streptococcus salivarius ssp.thermophilus • mucoid character • clonal heterogeneity

Submitted on March 4, 1993
Accepted on October 18, 1993




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