Molecular Profiling of Rice Straw Degradability Discrepancy in Core Germplasm.

The rice- pattern is a rapidly growing agricultural practice for straw disposal and mushroom production in China. However, different strains show a large variation in rice straw degradability. Here, we constructed a core collection of containing 14 strains with rich genetic diversity. The molecular profiling of the lignocellulose degradability discrepancy of strains was then explored using enzyme activity assays and transcriptome analysis. The results indicated that mycelial growth rate, lignocellulolytic enzyme activities, and rice straw degradability differed widely among the core strains. The genes encoding lignin modifying and degrading auxiliary enzymes, oxidases, glycoside hydrolases, and detoxification proteins were differentially expressed between two representative strains, resulting in differences in their lignocellulolytic enzyme activities and further causing differences in lignocellulose degradability. This study is useful to improve the production efficiency of and promote the recycling of rice straw.