Insights into the evolution and mechanisms of response to heat stress by whole genome sequencing and comparative proteomics analysis of the domesticated edible mushroom Lepista sordida

Lepista sordida is a valuable edible mushroom rich in natural bioactive compounds. In the present study, a high-quality whole-genome of a domesticated strain of L. sordida was sequenced, revealing a 40.67 Mb genome in 13 contigs. Phylogenetic analysis revealed that L. sordida is evolutionarily closely related to edible mushroom Lyophyllum decastes and Hypsizygus marmoreus. Heat stress has a significant effect on the yield and quality of mushrooms, but the molecular basis for this is poorly understood in L. sordida. A label-free comparative proteomic analysis was performed under different heat stress conditions. The growth of L. sordida mycelia was inhibited, and nuclear apoptosis occurred under heat stress. Ca2+ and MAPK signaling pathways were found to be involved in heat stress signal transduction. It is hypothesized that the expression of various heat shock proteins plays a crucial role in the response to heat stress. In addition, the components of the ubiquitin-proteasome system and the thioredoxin system were upregulated, preventing the accumulation of misfolded proteins and possibly supporting the response to heat stress. In summary, these results provide a fundamental insight into the evolution and heat stress-responsive mechanisms in L. sordida and may facilitate the breeding of heat-tolerant strains for artificial cultivation.