Effect of Temperature on Growth of Psychrophilic and Psychrotrophic Members of Rhodotorula Aurantiaca

• Main Authors: Sabri, Ahmed, Jacques, Philippe, Weekers, Frederic, Bare, Ghislain, Hiligsmann, Serge, Moussaif, Mustapha, Thonart, Philippe
• Format: Article in Journal/Newspaper
• Language: English
• Published: Humana Press 2000
• Subjects: Rhodotorula aurantiaca; growth kinetics; psychrophilic; psychrotrophic; cold adaptation; Life sciences; Biotechnology; Sciences du vivant; Biotechnologie; Antarc*; Antarctic
• Online Access: https://orbi.uliege.be/handle/2268/6388; https://doi.org/10.1385/abab:84-86:1-9:391

peer reviewed The thermo-dependence of growth kinetic parameters was investigated for the Antarctic psychrophilic strain Rhodotorula aurantiaca and a psychrotrophic strain of the same species isolated in Belgium (Ardennes area). Cell production, maximum growth rate (mu max), and half-saturation constant for glucose uptake (Ks) of both yeasts were temperature dependent. For the two yeasts, a maximum cell production was observed at about 0 degree C, and cell production decreased when temperature increased. The mu max values for both strains increased with temperature up to a maximum of 10 degrees C for the psychrophilic strain and 17 degrees C for the psychrotrophic strain. For both yeasts, Ks for glucose was relatively constant at low temperatures. It increased at temperatures above 10 degrees C for the psychrophilic strain and 17 degrees C for the psychrotrophic strain. Although its glucose affinity was lower, the psychrotrophic strain grew more rapidly than the psychrophilic one. The difference in growth rate and substrate affinity was related to the origin of the strain and the adaptation strategy of R. aurantiaca to environmental conditions.