Theoretical and experimental evidence of extinction and coexistence of killer and sensitive strains of yeast grown as a mixed culture in water

A. S. Vadasz, P. Vadasz, A. S. Gupthar, M. E. Abashar

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Theoretical and experimental evidences of extinction and coexistence during batch interaction of killer and sensitive strains of Saccharomyces cerevisiae grown as a mixed culture in pure water are provided. The experimental results show that in the limited nutrient conditions of growth in pure water, the killer yeast is subject to extinction when the initial concentration ratio of killer to sensitive yeast is 1:100. However, if the initial concentration ratio of killer to sensitive yeast is 1:1, both strains coexist. Substantial damped oscillations are associated with the growth process in the mixed culture. A new theoretical model that was originally developed for recovering the growth of single species in isolation is extended and applied to two species competing over a common ecological niche. The solutions of the model are shown to recover all the qualitative features captured in the experiments.

Original languageEnglish (US)
Pages (from-to)157-174
Number of pages18
JournalInternational Journal of Food Microbiology
Volume84
Issue number2
DOIs
StatePublished - Jul 25 2003
Externally publishedYes

Keywords

  • Competitive exclusion
  • Extinction and coexistence
  • Nutritional stress
  • Population dynamics
  • Yeast growth

ASJC Scopus subject areas

  • Food Science
  • Microbiology

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