Osmotolerant yeast species differ in basic physiological parameters and in tolerance of non-osmotic stresses
Language English Country Great Britain, England Media print-electronic
Document type Comparative Study, Journal Article, Research Support, Non-U.S. Gov't
PubMed
24962688
DOI
10.1002/yea.3024
Knihovny.cz E-resources
- Keywords
- desiccation survival, non-conventional yeasts, oxidative stress, salt stress, yeast osmotolerance,
- MeSH
- Stress, Physiological * MeSH
- Carbohydrate Metabolism MeSH
- Microbial Viability drug effects MeSH
- Osmotic Pressure * MeSH
- Polymers metabolism MeSH
- Saccharomycetales drug effects growth & development physiology MeSH
- Salts metabolism MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Comparative Study MeSH
- Names of Substances
- Polymers MeSH
- polyol MeSH Browser
- Salts MeSH
Osmotolerance is the ability to grow in an environment with a high osmotic pressure. In this study we compared the physiological parameters and tolerance to osmotic and non-osmotic stresses of three osmotolerant yeast species, Debaryomyces hansenii, Pichia farinosa (sorbitophila) and Zygosaccharomyces rouxii, with those of wild-type Saccharomyces cerevisiae. Although the osmotolerant species did not differ significantly in their basic parameters, such as cell size or growth capacity, they had different abilities to survive anhydrobiosis, potassium limitation or the presence of toxic cationic drugs. When their osmotolerance was compared, the results revealed that some of the species isolated as sugar/polyol-tolerant (e.g. P. farinosa) are also highly tolerant to salts and, vice versa, some strains isolated from an environment with high concentration of salt (e.g. Z. rouxii ATCC 42981) tolerate high concentrations of sugars. None of the tested strains and species was osmophilic. Taken together, our results showed that P. farinosa (sorbitophila) is the most robust species when coping with various stresses, while Z. rouxii CBS 732, although osmotolerant in general, is not specifically salt-tolerant and is quite sensitive to most of the tested stress conditions.
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