Metabolic Reprogramming During Heat Stress and Short-Term Recovery in Oudemansiella raphanipes Revealed by Integrated Metabolomics and Transcriptomics

Temperature constrains stable mycelial growth and production of Oudemansiella raphanipes, but its molecular response to heat stress followed by recovery remains insufficiently resolved. We integrated untargeted LC-MS metabolomics and RNA sequencing to compare control mycelia maintained at 28 °C (HPJZ28) with mycelia exposed to 42 °C for 6 h and then allowed to recover at 28 °C for 2 h (HPJZ42-R). Metabolomic and transcriptomic profiles separated clearly between the two conditions, indicating broad post-heat recovery-associated molecular remodeling. Most differential metabolites were lower in HPJZ42-R, whereas a smaller subset accumulated, suggesting selective metabolic reorganization rather than generalized activation. Transcriptome analysis identified extensive gene-expression remodeling, with 1081 upregulated and 1878 downregulated genes in the HPJZ28 versus HPJZ42-R comparison. Pathway-level analyses implicated central carbon metabolism, lipid metabolism, amino acid metabolism, peroxisome-related processes, and calcium signaling. Because the sampling design included a recovery period and a single post-stress time point, integrated gene–metabolite correlations are interpreted as exploratory associations rather than evidence of direct regulatory coupling. These results provide species-level multi-omics evidence for the post-heat recovery state of O. raphanipes and identify candidate pathways for future functional and physiological validation.