Geranyl Pyrophosphate

Geranyl pyrophosphate (GPP) is a foundational C10 isoprenoid intermediate in plant secondary metabolism, not typically detected as a volatile terpene in cannabis flower or vapor. Rather, GPP functions as a biochemical precursor in the mevalonate and methylerythritol phosphate (MEP) pathways, where it condenses with isopentenyl pyrophosphate (IPP) to form larger terpene skeletons. In cannabis genetics, GPP availability and the activity of enzymes downstream of it directly influence the accumulation of monoterpenes (C10) and sesquiterpenes (C15). Understanding GPP's role helps explain variability in terpene expression across cultivars and environments.

Breeders working on terpene-rich cultivars benefit from recognizing GPP as a metabolic bottleneck; upregulating GPP synthase activity or optimizing precursor availability can shift monoterpene ratios and sesquiterpene diversity. Lineage records and cannabinoid–terpene studies frequently examine this intermediate to predict stable chemotype expression across generations.