title: Osmotolerant yeast species differ in basic physiological parameters and in tolerance of non-osmotic stresses.
abstract: 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.
authors: Department of Membrane Transport, Institute of Physiology Academy of Sciences of the Czech Republic, Prague 4, Czech Republic; Department of Biochemistry, Faculty of Science, Charles University in Prague, Czech Republic.
authors: Michala
authors: M
authors: Bubnová
authors: Jana
authors: J
authors: Zemančíková
authors: Hana
authors: H
authors: Sychrová
mesh_terms: D050260:Carbohydrate Metabolism; D050296:Microbial Viability / Q000187:drug effects*; D009997:Osmotic Pressure; D011108:Polymers / Q000378:metabolism; D004718:Saccharomycetales / Q000187:drug effects* / Q000254:growth & development / Q000502:physiology*; D012492:Salts / Q000378:metabolism; D013312:Stress, Physiological
chemical_list: D011108:Polymers; D012492:Salts; C024617:polyol
keywords: desiccation survival; non-conventional yeasts; oxidative stress; salt stress; yeast osmotolerance