Fig. 5

Effect of LaCl₃ on cellulase production after Sr²⁺ treatment. pNPCase (a) and CMCase (b) activity were measured in the RUT-C30 strain after treatment with Sr²⁺ or LaCl₃. The transcriptional levels of cbh1 (c) and egl1 (d) were determined after culturing the RUT-C30 strain in medium supplemented with 0 or 70 mM Sr²⁺ and with (+) or without (−) 5 mM LaCl₃. 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)