Secondary Metabolite Expression

Secondary metabolite expression refers to the production of compounds in cannabis beyond primary growth and reproduction—including cannabinoids, terpenes, and phenolic compounds. These molecules develop during flowering and post-harvest ripening, influenced by genetics, environment, light spectrum, nutrient availability, and plant age. Expression levels vary significantly between cultivars and even individual plants within the same strain, creating chemical diversity within seed populations. Breeders studying secondary metabolite expression track cannabinoid ratios, terpene profiles, and flavonoid production to develop stable lineages with predictable chemical outcomes. Understanding metabolite expression patterns is foundational to breeding for consistent quality and targeted chemical profiles.

Breeders select parents demonstrating stable, heritable secondary metabolite expression patterns to create F1 and F2 generations with reproducible chemical signatures. Phenotypic screening across cultivation environments helps identify genotypes that maintain expression consistency across variables like temperature and photoperiod.