Phytochrome Regulation

Phytochrome regulation is not a terpene, but rather a plant photomorphogenesis mechanism that influences cannabinoid and terpene expression in cannabis. Phytochromes are photoreceptor proteins that detect red and far-red light wavelengths, triggering developmental responses including flowering timing, stem elongation, and secondary metabolite synthesis. In cannabis cultivation, light spectrum and photoperiod interact with phytochrome signaling to modulate the plant's metabolic pathways. Breeders and cultivators studying this system aim to understand how light conditions affect terpene and cannabinoid profiles across different genetic backgrounds. This regulatory layer represents an environmental variable that can impact phenotypic expression independent of genotype alone.

Breeders working with controlled environment cultivation leverage phytochrome knowledge to optimize light recipes for target terpene profiles and flowering responses. Seed companies testing cultivars across different photoperiods and light spectra use phytochrome responses as a selection criterion for stable, predictable phenotypes.