Fig. 3

Effects of 3 mM Zn²⁺ on cellulase-related gene transcription levels in the Trichoderma reesei RUT-C30 strain. Transcriptional levels of cbh1 (a), cbh2 (b), egl1 (c), egl2 (d), xyn1 (e), xyr1 (f), and ace3 (g) of the RUT-C30 strain were detected after culturing for 36, 48 or 60 h in liquid MM containing 0 or 3 mM Zn²⁺ with 1% (w/v) Avicel as the sole carbon source. The final values are presented as the means ± standard deviation (SD) of three independent experimental results. Asterisks indicate significant differences compared with the control (*P < 0.05, according to Student’s t-test). MM, minimal medium