Saccharomyces cerevisiae is one of the main functional bacteria in Daqu .Studying the yeast groups of different species of Daqu and the fermentation characteristics of the dominant yeast is helpful to the control of Daqu production process and the screening and application of functional bacteria of Daqu . Using mature high-temperature Daqu,medium-temperature Daqu and low-temperature Daqu as test materials,the yeast in Daqu was isolated,purified and molecular identified,and the characteristics of temperature,acid,alcohol and enzyme production of the dominant yeast were preliminarily explored .One dominant yeast strain was obtained from each of the three types of Daqu . Saccharomyces cerevisiae (Number:GY1) and Wickerhamomyces (Number:ZY1,DY1) were identified .All the three strains of dominant yeast had a certain tolerance to alcohol,and the ability to produce pectinase,amylase,cellulase,protease and esterification enzyme,w hich could provide strain resources for the screening and production of flavor-producing yeast in liquor .
DaquSaccharomyces cerevisiaebacterial strainsubstratetransparent zone
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