FLOCCULATION OF INDUSTRIAL AND LABORATORY STRAINS OF SACCHAROMYCES-CEREVISIAE

A comparative study has been made of different laboratory and industri al wild-type strains of Saccharomyces cerevisiae in relation to their flocculation behavior. All strains were inhibited by mannose and only one by maltose. In regard to the stability of these character in the p resence of proteases and high salt concentrations, a relevant degree o f variation was found among the strains. This was to such an extent th at it did not allow their inclusion in the Flo1 or NewFlo phenotypes. Genetic characterization of one wild-type strain revealed that the flo cculation-governing gene was allelic to FLO1 found in genetic strains.