Methylerythritol Phosphate Pathway

The methylerythritol phosphate (MEP) pathway, also known as the non-mevalonate or DOXP pathway, is a primary biosynthetic route for isoprenoid precursors in plants. In cannabis, this pathway operates alongside the mevalonate pathway to generate the building blocks for terpenoid synthesis—the volatile compounds responsible for strain-specific aroma profiles. The MEP pathway is particularly active in chloroplasts and is thought to contribute significantly to monoterpene and sesquiterpene production across diverse cultivars. Understanding MEP pathway function helps breeders contextualize how genetic and environmental factors influence terpene accumulation and chemotype expression.

Breeders studying terpene diversity increasingly recognize the MEP pathway as a target for selective breeding, since pathway enzyme expression directly correlates with terpenoid quantity and diversity. Strains exhibiting high levels of limonene, pinene, and other monoterpenes are often those with robust MEP pathway activity, making this biochemical route relevant to cultivar development focused on