Fig. 2

Solid-state fermentations of rice straw by NJAU4742 strain under the different treatments of SSF3.0, SSF6.0 and SSF9.0. The release of CO₂ was detected in 7 days of solid-state fermentation (a). The pictures of solid-state fermentation of rice straw by NJAU4742 strain for the 7th day at pH 3.0, 6.0 and 9.0 and the scanning electron micrographs of natural rice straw (CK) and rice straw in SSF for the 7th day are shown (b). The bars indicate the standard error of three replicates