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GROWTH OF SACCHAROMYCES CEREVISIAE AND SACCHAROMYCES UVARUM IN A TEMPERATURE GRADIENT INCUBATOR
Author(s) -
Walsh R. M.,
Martin P. A.
Publication year - 1977
Publication title -
journal of the institute of brewing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.523
H-Index - 51
eISSN - 2050-0416
pISSN - 0046-9750
DOI - 10.1002/j.2050-0416.1977.tb06813.x
Subject(s) - brewing , saccharomyces cerevisiae , yeast , saccharomyces , strain (injury) , incubator , biology , food science , biochemistry , microbiology and biotechnology , fermentation , anatomy
A temperature gradient incubator has been used to determine the effect of temperature on the growth of strains of Saccharomyces cerevisiae and Saccharomyces uvarum (including lager brewing yeasts formerly classified as Saccharomyces carlsbergensis ). The maximum temperatures for growth (T max ) for all strains of S. cerevisiae examined were in the range 37.5°C‐39.8°C and the optimum temperatures for the most rapid initial growth (T opt ) were in the range 30.0°C‐35.0°C. Strains of S. uvarum , however, formed two distinct groups: Group A (including all brewing strains of S. uvarum tested) had T max values 31.6°C‐34.0°C and T opt values 26.8°C‐30.4°C; Group B had T max values 38.2°C‐40.0°C and T opt values 30.0°C‐34.6°C. It is proposed, therefore, that the species name S. carlsbergensis should be re‐introduced and applied to those strains of S. uvarum (Group A) which have the lower T max values. Minimum temperatures for growth (T min ) of the yeasts were not investigated as initial studies had shown that they could not be measured satisfactorily. Measurements of the generation times for one brewing strain of S. cerevisiae and one brewing strain of S. uvarum (Group A) over the temperature range 6.0°C‐22.0°C have shown that there are significant differences between the yeasts at the lower end of the temperature range and that the relationship between generation time (GT) and temperature (T) for both yeasts closely follows the mathematical expression: