Secondary Metabolite

Secondary metabolites are organic compounds produced by cannabis plants that are not directly essential for basic growth or reproduction, yet play important ecological and chemical roles. This family includes cannabinoids (THC, CBD, CBG), terpenes, and flavonoids—compounds that accumulate in trichomes and contribute to the plant's chemical profile. Unlike primary metabolites such as sugars and proteins, secondary metabolites are synthesized through specialized enzymatic pathways and vary significantly between strains and phenotypes. Understanding secondary metabolite production is central to cannabis breeding, as these compounds influence both the plant's defensive capabilities and its chemotype classification. Breeders select for secondary metabolite expression to stabilize desired chemical profiles across generations.

Breeders leverage secondary metabolite biosynthesis pathways to develop stable chemotypes—strains reliably producing specific ratios of cannabinoids and terpenes. Selective breeding for high expression of particular secondary metabolites requires understanding genetic markers and environmental factors that regulate their accumulation.