FIGURE 7.

A model showing the effects of blue, red, and far-red radiation on physiological responses at cellular and leaf scales that affect vegetative growth and pigment synthesis in romaine lettuce. Model parameters include blue light (B), red light (R), far-red light (FR), leaf photosynthesis rate (LPR), phytochrome photostationary state (PSS), average leaf number per plant (L_N), average area of individual leaf (LA_s), chlorophylls level (Chl), beta-carotene level (β-carotene), anthocyanins level, canopy area (CA), and shoot dry weight (SDW). Black and red arrows indicate positive and negative relationships, respectively, between two parameters.