REPRESSION OF GALACTOSE UTILIZATION BY GLUCOSE IN THE CITRATE-PRODUCING YEAST CANDIDA-GUILLIERMONDII

A strain of the yeast Candida guilliermondii has been shown to produce citric acid from galactose to a similar extent, and at a similar rate , as from glucose. At an initial concentration of 36 g/l of either glu cose or galactose, citric acid production exceeds 13 g/l. When galacto se and glucose are present in a mixture, however, galactose utilizatio n is delayed until most of the glucose has been utilized, providing ev idence for catabolite repression.