Growth, sugar concentration and cellulase activity of Rut-C30 and Δ pgi1 mutants. (A) MM with glucose, repressing conditions. (B) MM with glucose and fructose. (C) MM with lactose and glucose. (D) MM with lactose and fructose. Rut-C30: blue triangles, P40: green squares and P58: red circles. Code for sugar concentration is indicated in each graphic. 1 nkat = 1 mmol of methylumbelliferyl released from MUL per second. Cultures were grown at 30°C and 200 rpm. Triplicates of each strain were cultured for each sugar condition. Error bars indicate standard deviation.