The production of yeast killer toxin is a well established
phenomenon in yeast genera and species. Killer yeast
secretes a pore forming, proteinaceous killer toxin lethal to
susceptible yeast strains1. The killer activity yeast readily
detectable only when a suitable sensitive strain is tested.
The killer strain is immune to the effect of its own toxin.
The effect of killer toxin is dependent both on its own
potency and susceptibility of treated cells under selected
conditions. The susceptibility of sensitive yeast to killer
toxin is known to depend on various factors such as
selected killer toxin, the exposed yeast strain, its growth
phase and the state of culture under given experimental
condition