Tabiiy fanlar

EVALUATION OF STABILITY AND VARIABILITY OF COLLECTION YEAST FUND UNDER LONG-TERM STORAGE CONDITIONS

collection, storage methods, yeast activity, viability.

Authors

The results of the assessment of the viability and stability of Candida and Wickerhamomyces yeasts stored by various methods in the collection fund of the Institute of Microbiology of the Academy of Sciences of the Republic of Uzbekistan are presented. All studied strains retained activity after long-term storage. Regular subculture and freeze-dried storage proved to be the most effective for Candida and Wickerhamomyces cultures - these methods ensured high viability and stability of morphological and cultural characteristics. When stored under mineral oil, a decrease in physiological cell activity and partial variability in morphological characteristics are observed. Two to three consecutive passages completely restore the morphology, cell size, and cultural properties of the yeast. The data obtained confirm that regular subculture and freeze-drying are the most reliable methods for long-term preservation of Candida and Wickerhamomyces strains, ensuring the stability of their cultural and morphological characteristics. Storage under mineral oil can be used as an auxiliary method; however, a regeneration step is necessary before practical use of such cultures.