More food for thought on UBA UVB. I will also post the red for those interested.
Cannabinoids
Cannabinoids are synthesized in secretory cells inside glandular trichomes, which are highly concentrated in unfertilized female flowers before senescence (
Potter, 2004,
2009).
Shoyama et al. (2008) found that cell death was induced when cannabis leaves secrete cannabinoids from glandular trichomes into leaf tissue.
Lydon et al. (1987) reported increased THC concentrations when cannabis plants were grown with supplemental UV-B radiation, suggesting that cannabinoids may play some role in UV protection. Limited published research exists on the role of cannabinoids in cannabis plants.
Flavonoids
Flavonoids are sensitive to light quality, and flavonoid concentrations in plants are higher when grown under UV, blue, and FR light treatment (
Fu et al., 2016;
Pedroso et al., 2017;
Liu et al., 2018). The two-ring, 15-carbon, general structure of flavonoids makes this group structurally and functionally diverse. Flavonoids comprise many classes (flavonols, flavones, flavanones, anthocyanins, and isoflavonoids) that are defined by various accessory groups attached to the central 15-carbon skeleton (
Iwashina, 2000). This allows for their important roles as pollinator and feeding attractants, oviposition stimulants, and feeding deterrents, as well as in plant disease resistance and managing light stress (
Hamamura et al., 1962;
Ingham, 1972;
Arakawa et al., 1985;
Noh and Spalding, 1998;
Nishida, 2005;
Goff and Klee, 2006). Optimal lighting systems for cannabis growth and production must include an optimal light spectrum for flavonoid production. UV, blue, and FR are beneficial wavelengths that should be given greater consideration.
