FhMYB108 Regulates the Expression of Linalool Synthase Gene in Freesia hybrida and Arabidopsis

Acting as the most abundant and widely distributed volatile secondary metabolites in plants, terpenoids play crucial roles in diverse physiological regulations and metabolic processes. Terpene synthases play a decisive role in determining the composition and diversity of terpenoids. Though the regulation of terpene synthases has been extensively investigated across various plant species, limited studies have focused on the upstream transcriptional regulation of terpene synthases. In this study, we have identified linalool as the predominant volatile compound that is released gradually from flowers throughout flower blooming. In the context of the transcriptome, a typical MYB transcription factor, FhMYB108, was screened based on homologous gene comparison. is capable of regulating the expression of , and both their expression levels showed gradual increase during flower opening. Moreover, exerts a stimulatory effect on the transcription of , while no significant increase in expression is observed upon the stabilization of in . The highly expressed in could interact with to suppress the activation of by . The present study not only elucidates the regulatory mechanism underlying linalool synthesis but also discovers the synergistic effect of MYB and bHLH transcription factors in governing the biosynthesis of volatile terpenoids.