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Article Abstract
The three-phase structure of solid-state fermentation (SSF) directly affects substrate degradation and fermentation efficiency. However, the mechanism of three-phase regulation on lignocellulose utilization and microbial metabolism is still unclear. Based on comparative transcriptome analysis, a lignocellulose degrading enzyme, manganese peroxidase (GlMnP), which was significantly affected by water stress meanwhile related to triphase utilization, was screened to reveal the mechanism using Ganoderma lucidum as the reference strain. The results showed that GlMnP directly participates in lignocellulose degradation by positively regulating the activity of carboxymethylcellulase (CMCase), filter paper (FPAse), and laccase (LACase) enzymes, and indirectly participates in lignocellulose degradation by negatively regulating the redox levels in microorganisms. In addition, GlMnP can also control microbial glycolysis rate to enhance lignocellulose utilization. The results indicated that GlMnP participates in the liquid-solid-gas triphase regulation on lignocellulose degradation by G. lucidum in SSF.
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