Blue and UV-A light wavelengths positively affected accumulation profiles of healthy compounds in pak-choi.

The growth and healthy compound contents of pak-choi were significantly improved by supplemental blue and UV-A light, and there were wavelength- and cultivar-dependent effects. Compared with control, T430 presented the higher biomass and the contents of total phenolics, flavonoids and pigment in two pak-choi cultivars, and T380 was an efficient strategy to increase antioxidants and health-promoting compounds of red-leaf pak-choi. © 2020 Society of Chemical Industry.