Gene expression analysis. (A) Relative expression of gpdh. (B) Relative expression of xyr1. (C) Relative expression of xyl1. Strains were first grown in 500-ml flasks containing 100 ml of MM with 10 g l-1 glucose and 10 g l-1 fructose with 2 g l-1 of peptone for 30 h at 150 rpm and 30°C. Mycelia were transferred to MM containing either glucose or lactose. Samples taken after 0, 6 and 14 h of culture from glucose media are indicated as G0, G6 and G14. Samples from lactose at the same times are named L0, L6 and L14. Two independent experiments were done. Error bars indicate standard deviation. Each strain is represented by a different colour. Rut-C30: blue, P40: green and P58: red. Bars with 1 asterisk (*) are significantly different to Rut-C30 (P < 0.05) and bars with 2 asterisks (**) are extremely significantly different to Rut-C30 (P < 0.001).