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  • 1 University of Pécs Department of General and Environmental Microbiology, Faculty of Sciences Pécs Hungary
  • | 2 University of Pécs Institute of Biophysics Pécs Hungary
  • | 3 University of Pécs Department of Biochemistry and Medical Chemistry, Faculty of Medicine Pécs Hungary
  • | 4 University of Szeged Department of Microbiology, Faculty of Science and Informatics Szeged Hungary
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A carotenoid-less Phaffia rhodozyma mutant (MCP 325) exhibited significantly higher resistance to oxidative stressors such as menadione, H2O2 and K2Cr2O7 than its astaxanthin-producing parental strain (MCP 324). The absence of carotenoids in the mutant did not explain this phenomenon. The cause of the decreased superoxide, hydroxyl radical and glutathione contents, the increased peroxide concentration and the elevated specific activity of catalase under uninduced conditions may be a second mutation. Peroxide treatment induced specific catalase activity in the mutant but not in the parental strain. Regulation of these processes led to the result that, in spite of the mutations, the two strains exhibited the same multiplication rate and generation time.

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