Secondary Metabolite Expression

Secondary metabolite expression refers to the biosynthetic pathways and genetic regulation controlling non-essential compounds in cannabis, including cannabinoids, terpenes, and flavonoids. Unlike primary metabolites required for basic plant function, secondary metabolites accumulate in trichomes and leaf tissue, shaped by genotype, environment, and developmental stage. Breeders study expression patterns to understand chemotype diversity and stability across generations. This trait family encompasses the genetic architecture determining which metabolites a plant prioritizes, their concentration ranges, and timing of peak accumulation. Expression varies substantially within and across strain lineages, making it a key focus in breeding programs targeting specific chemical profiles.

Breeders track secondary metabolite expression as a heritable trait influencing final product chemistry and consistency. Understanding expression regulation helps stabilize desired chemotypes in F2+ generations and predict offspring variation from parent crosses.