Circadian Compound Expression

Circadian compound expression refers to the time-dependent variation in terpene and cannabinoid profiles within cannabis plants, driven by diurnal light and temperature cycles. Researchers observing cannabinoid-rich cultivars have noted measurable shifts in volatile terpene concentrations between morning, midday, and evening sampling windows. This phenomenon is distinct from simple degradation; living plant tissue actively regulates secondary metabolite production in response to circadian rhythms. Understanding these fluctuations is relevant for harvest timing protocols and standardized sample collection in breeding programs. The degree of circadian variation appears to differ across genetic lines, suggesting heritable components warrant further investigation.

Breeders working in controlled-environment agriculture increasingly document sampling time as a critical variable when establishing strain terpene profiles. Selecting for stable or predictable compound expression across diurnal cycles may inform consistency in downstream processing and product formulation.