Mep Pathway

The MEP pathway (methylerythritol phosphate pathway) is a biosynthetic route through which plants produce monoterpenes and sesquiterpenes—the volatile organic compounds responsible for cannabis aroma profiles. Unlike the older MVA (mevalonate) pathway, the MEP route operates primarily in plant chloroplasts and is considered the dominant terpene-synthesis mechanism in cannabis and most modern cultivars. Lineage records and breeding literature frequently reference MEP-pathway activity when discussing terpene expression and volatile production in cannabis genetics. Understanding this biochemical mechanism helps breeders predict which strain families may express characteristic terpene combinations and how environmental stress or genetic selection might influence aromatic phenotypes.

Breeders working to stabilize terpene-rich phenotypes often consider MEP-pathway efficiency as a selection marker, since cultivars with robust chloroplastic terpene synthesis tend to express more pronounced volatile profiles. Crossing lines known for high MEP-pathway activity can help establish predictable aromatic breeding populations.