Chlorophyll

Chlorophyll is the primary photosynthetic pigment responsible for light absorption and energy conversion in cannabis plants. In living tissue, chlorophyll appears green due to its peak absorption in blue and red wavelengths while reflecting green light. During the growth and flowering phases, chlorophyll concentration and composition can shift, particularly as plants age or experience stress. Breeding programs often monitor chlorophyll retention and breakdown patterns as indirect markers of plant vigor, nutrient status, and maturation timing. The visible changes in leaf color—from deep green in early growth to yellowing or purpling in late flowering—are partly driven by chlorophyll degradation and the emergence of other pigments like anthocyanins and carotenoids.

Breeders track chlorophyll dynamics to assess plant health, nitrogen metabolism efficiency, and phenotype stability across growing conditions. Lines selected for extended chlorophyll retention may indicate stronger photosynthetic capacity or delayed senescence, traits relevant to yield-focused breeding programs.