Abstract
This study investigated the potential benefits of utilizing salicylic acid (SA) and magnetic field (MF) as elicitors to increase mycelia mass and triterpenoids content in the liquid fermentation of Morchella eximia, an abundant edible and medicinal fungus. The results showed that SA and MF could increase mycelia mass and triterpenoids content, and the combination of the two (MF intensity 2.5 mT, SA concentration 200 mmol/L) had the most significant promotion effect on them. This was supported by transcriptome analysis results, which indicated that the upregulation of mvaK2, ERG3, ERG26, SOAT, EBP, and ERG1 genes involved in terpenoid backbone biosynthesis and steroid biosynthesis pathways, particularly those related to squalene biosynthesis, contributed to the increased triterpenoids content in M. eximia induced by the MF+SA combination. The findings provided insights into the potential mechanisms underlying the improvement of triterpenoids production in M. eximia and offered a theoretical basis for enhancing triterpenoids production in edible and medicinal fungi using chemical and physical elicitors.
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