Compared to the control strain FB3X, ethanol production from xylose in strains F102X, F104X and F106X was increased by
4.3, 9.5 and 17.2%, respectively. F106X produced 18.2% less glycerol from a glucose–xylose mixture medium than FB3X, whereas no glycerol production was detected in these four strains when grown on a xylose medium.