The Relationship Between Tolerance and Respond of Saccharomyces cerevisiae Strains Against Different Stress Treatments
Behaviour of Saccharomyces cerevisiae Strains
Keywords:Saccharomyces cerevisiae, temperature stress, ethanol stress, intacellular trehalose
This study evaluated the stress tolerance and stress responds of three indigenous Saccharomyces cerevisiae strains and one reference strain against temperature (45°C, 50°C, and 55°C) and ethanol (12 and 14%) stresses over time by assessing the yeast counts and intracellular trehalose content. The maximum decrease in the yeast counts was at 55°C and 14%, and also, 45°C and 14% caused highest intracellular trehalose content for all strains when each treatment evalulated among its variables (P < 0.05). The correlation between the trehalose content and Log N levels of the strains was significant with the correlation coefficient (r) 0.62 and 0.39 for strains 2 and 7 against temperature stress, also a strong and significant correlation was determined with r values for strains 2,7, 47 against ethanol stress, respectively (P < 0.05).
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