Fig. 7

Effect of ROS on Sr²⁺-induced cellulase production. pNPCase activity (a and c), CMCase activity (b and d), and biomass dry weight (e) were determined in the RUT-C30 strain after treatment with (or without) 70 mM Sr²⁺, 4 mM H₂O₂, or 3 mM NAC in MM. The final values are represented as the mean ± standard deviation (SD) of three independent experimental results. Asterisks indicate significant differences compared to the strain without Sr²⁺ treatment (p < 0.05, according to Student’s t-test). MM, minimal medium; ROS, reactive oxygen species