Fig. 3

Enzyme activities and pH change in solid-state fermentations of rice straw by NJAU4742 strain under the different treatments of SSF3.0, SSF6.0 and SSF9.0. During the solid-state fermentation process, extracellular xylanase activities (a), extracellular endoglucanase activities (b), extracellular exoglucanase activities (c), extracellular protein concentrations (d) and environmental pH changes (e) were detected. The environmental pH changes when natural rice straw was degraded only by crude enzymes from NJAU4742 strain were also detected (f). The bars indicate the standard error of four replicates