Phytocannabinoid Expression

Phytocannabinoid expression refers to the biochemical processes that determine which cannabinoids (THC, CBD, CBG, etc.) a cannabis plant produces and in what ratios. This trait is controlled by genetic inheritance, enzyme activity, and environmental factors during cultivation. Expression profiles vary widely across cultivars—some plants naturally produce high THC with minimal CBD, while others express a balanced or CBD-dominant profile. Understanding phytocannabinoid expression is foundational to cannabis breeding, as it directly influences the chemical composition breeders and researchers can expect from offspring. Expression patterns are often heritable and can be mapped to specific genetic loci.

Breeders use phytocannabinoid expression profiles as a primary selection criterion when developing new lines, stabilizing cultivars with consistent cannabinoid ratios, and creating chemovars suited to specific research or commercial applications. Tracking expression across generations helps breeders identify dominant and recessive expression traits and maintain predictable chemical outcomes.