Kluyveromyces Yeast Having Killer Activity against Zygosaccharomyces rouxii.

Abstract

To make use of the yeast killer toxin, we attempted to screen Kluyveromyces strains producing a killer toxin which acts in the presence of NaCl. Among Kluyveromyces IFO type strains tested, K. thermotolerans IFO 1778, K. vanudenii IFO 1673, K. lactis IFO 1267 and K. phafii IFO 1672 strains were shown to have killer activities against Z. rouxii in the presence of NaCl. And K. thermotolerans IFO 1778 strain showed the most marked effect on the growth of Z. rouxii in the presence of NaCl. The killer type of IFO 1778 strain did not correspond to the K1～Kll type, and its killer character seemed to be controlled by nuclear gene(s).