Figure 4

Effects of LED light quality (RL, GL, and BL) and intensity (0, 50, and 200 µmol m−2 s−1 photosynthetic photon flux density) treatments on flavonoid (panels A, C), and phenolic acid (panels B, D) of coriander plants at 45 days after sowing. There are five light quality treatments consisting of red light (RL), green light (GL), and blue light (BL) LED with different mixtures. Light treatments associated with the antioxidant measurements presented from left to right were no RL (G50 + B50), control (R50 + G50 + B50), high RL (R200 + G50 + B50), no BL (R50 + G50), control (R50 + G50 + B50), and high BL (R50 + G50 + B200) treatments, respectively. Treatments were arranged in a completely randomized design with 3 replicates, and 10 plants from each light quality and intensity treatment were used for the plant antioxidant measurements. Vertical bars indicate the standard deviation. The values followed by a different letter show statistically significant differences at p < 0.05 (n = 10).