Obligate psychrophilic, facultative psychrophilic, and mesophilic yeasts were cultured in a carbon-rich medium at different temperatures to investigate whether growth parameters, lipid accumulation, and fatty acid (FA) composition were adaptive and/or acclimatory responses. Acclimation of facultative psychrophiles and mesophiles to a lower temperature decreased their specific growth rate, but did not affect their biomass yield (Y(X/S)). Obligate and facultative psychrophiles exhibited the highest Y(X/S). Acclimation to lower temperature decreased the lipid yield (Y(L/X)) in mesophilic yeasts, but did not affect Y(L/X) in facultative psychrophilic ones. Similar Y(L/X) were found in both groups of psychrophiles, suggesting that lipid accumulation is not a distinctive characteristic of adaptation to permanently cold environments. The unsaturation of FAs was one major adaptive feature of the yeasts colonizing permanently cold ecosystems. Remarkable amounts of alpha-linolenic acid were found in obligate psychrophiles at the expense of linoleic acid, whereas it was scarce or absent in all the other strains. Increased unsaturation of FAs was also a general acclimatory response of facultative psychrophiles to a lower temperature. These results improve the knowledge of the responses enabling psychrophilic yeasts to cope with the cold and may be of support for potential biotechnological exploitation of these strains.
|Data di pubblicazione:||2009|
|Titolo:||Growth, lipid accumulation, and fatty acid composition in obligate psychrophilic, facultative psychrophilic, and mesophilic yeasts.|
|Autore/i:||Rossi, Maddalena; P., Buzzini; L., Cordisco; Amaretti, Alberto; M., Sala; Raimondi, Stefano; C., Ponzoni; Pagnoni, Ugo Maria; D., Matteuzzi|
|Digital Object Identifier (DOI):||10.1111/j.1574-6941.2009.00727.x|
|Codice identificativo ISI:||WOS:000268655100005|
|Codice identificativo Scopus:||2-s2.0-68249103965|
|Codice identificativo Pubmed:||19624740|
|Citazione:||Growth, lipid accumulation, and fatty acid composition in obligate psychrophilic, facultative psychrophilic, and mesophilic yeasts / Rossi, Maddalena; P., Buzzini; L., Cordisco; Amaretti, Alberto; M., Sala; Raimondi, Stefano; C., Ponzoni; Pagnoni, Ugo Maria; D., Matteuzzi. - In: FEMS MICROBIOLOGY ECOLOGY. - ISSN 0168-6496. - ELETTRONICO. - 69(3)(2009), pp. 363-372.|
|Tipologia||Articolo su rivista|
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