Circadian Terpenogenesis

Circadian terpenogenesis refers to the time-dependent fluctuation of terpene production in cannabis plants throughout a 24-hour cycle. Research in botanical chronobiology suggests that certain cultivars exhibit peak volatile compound emission during specific hours—typically early morning or dusk—driven by the plant's internal biological clock and light-dark cycles. This phenomenon affects the aromatic profile breeders observe when sampling at different times of day, potentially explaining variance in terpene quantification across studies. The mechanism remains incompletely understood but likely involves circadian regulation of secondary metabolism genes. Breeders working with photoperiod-sensitive strains have noted reproducible shifts in terpene ratios correlated with harvest timing and light schedules.

Understanding circadian terpenogenesis allows breeders to standardize aroma profiling protocols and select parent plants based on consistent volatile production patterns rather than single-point sampling. This trait informs cultivation recommendations, as light cycle manipulation may influence the final terpene composition in progeny lines.