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The occurrence of killer characters in yeasts
Abstract:
Strains of the genera Saccharomyces, Saccharomycodes, Schizosaccharomyces, Hanseniaspora, Kluyveromyces, Pichia, Kloeckera, and Torulopsis were examined for killer, sensitive, neutral, and killer-sensitive characteristics against a killer strain (NCYC738) and a sensitive strain (NYCC1006) of Saccharomyces cerevisiae. Thirty-one Saccharomyces cerevisiae strains out of 782 screened were able to kill the sensitive test strain; 707 appeared to be sensitive and 44 neutral. A high frequency of killer phenotypes (71.4%) was found in Hansenula anomala var. anomala strains. No killer strains were present in the remaining 17 species considered.
Insights
This study screened yeast strains for killer activity. Saccharomyces cerevisiae showed some killer strains, while Hansenula anomala var. anomala exhibited a high frequency of killer phenotypes.
Area of Science:
- Microbiology
- Yeast Genetics
- Antimicrobial Activity
Background:
- Killer yeast phenomena are important in winemaking and brewing.
- Understanding killer yeast distribution across different genera is crucial for industrial applications.
- Previous research has identified killer activity in various yeast species.
Purpose of the Study:
- To investigate the prevalence of killer, sensitive, and neutral phenotypes in several yeast genera.
- To identify specific yeast strains with killer activity against Saccharomyces cerevisiae.
Main Methods:
- Screening of 800+ yeast strains from genera including Saccharomyces, Hanseniaspora, Pichia, and Torulopsis.
- Testing yeast strains for killer, sensitive, neutral, and killer-sensitive interactions.
- Utilizing specific killer (NCYC738) and sensitive (NYCC1006) Saccharomyces cerevisiae strains as indicators.
Main Results:
- Out of 782 Saccharomyces cerevisiae strains, 31 were killer, 707 sensitive, and 44 neutral.
- Hansenula anomala var. anomala strains demonstrated a high frequency (71.4%) of killer phenotypes.
- No killer strains were detected in the other 17 yeast species examined.
Conclusions:
- Killer yeast activity is not uniformly distributed across all tested genera.
- Hansenula anomala var. anomala is a significant source of killer phenotypes.
- Further research into killer yeast mechanisms and applications is warranted.