| Summary: | <i>Sanghuangporus</i> <i>baumii</i> is a traditional medicinal fungus that produces pharmacological terpenoids, but natural resources are insufficient for applications, and its growth and development mechanisms are poorly understood. Combining metabolomic and transcriptomic analyses, we found four terpenoid hormones and a central gene, isopentenyl diphosphate isomerase (<i>IDI</i>), involved in growth and development. Additionally, an exogenous hormone test was used to further confirm the importance of the four terpenoid hormones. Finally, hormone content determination and qRT−PCR were performed to explore the growth and development mechanism; we found thatcis-zeatin (CZ) plays a major role in the mycelia stage, trans-zeatin (TZ) and gibberellin A4 (GA4) are important in the primordia stage, GA4 is crucial for the fruiting bodies stage, and abscisic acid (ABA) may be a marker of maturity. The <i>IDI</i> gene was also found to affectterpenoid hormone content by regulating the relative gene transcript levels, thereby controlling morphological changes in <i>S. baumii</i>. Our results revealthe growth and development mechanisms of <i>S. baumii</i> and may promote the breeding and utilisation of high-quality varieties.
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