| 摘要 |
Process for developing a baker's yeast strain having an Lti property, in which a haploid Saccharomyces cerevisiae strain having an Lti property is first crossed with a haploid Saccharomyces cerevisiae strain having at least one MAL allele which is active but under catabolic repression, then in a second stage, the segregants are crossed, and finally, a prototrophic diploid strain having an Lti phenotype, a Mal phenotype which is active but under catabolic repression, and a potential for growing in a fed-batch process, is selected. Industrial baker's yeast strain Saccharomyces cerevisiae which has a growth yield in a fed-batch process of 0.1 to 0.5 g of dry biomass/g of sugar, a CO2 production of less than 15 ml/h/kg of dough up to 8 DEG C., of less than 20 ml/h/kg of dough up to 12 DEG C., and also less than 10 ml per g of compressed yeast up to a temperature of 18 DEG C., after 4 days of culture in maltose-containing medium. The baker's dough including at least water, flour and the above described baker's yeast is disclosed, the dough is preserved at least 2 days under refrigeration. |
