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Watercress (Nasturtium officinale) is a perennial aquatic plant of the Brassicacea that contains a large amount of glucosinolates, which act as a natural antioxidant in the human body with anticancer activity and an ability to reduce active oxygen that attacks DNA. The aim of this study was to analyze the effects of blue light with red backlight conditions on growth and glucosinolates contents of watercress. Watercress seeds were sown on soil and seedling were grown for 2 weeks. Two weeks after sowing, watercress was transplanted to a hydroponic system with the following light conditions: R10 (Red:Blue = 10:0), R9B1 (Red:Blue = 9:1), R8B2 (Red:Blue = 8:2), R7B3 (Red:Blue = 7:3), R6B4 (Red:Blue = 6:4), and R1B1G1 (control, Red:Blue:Green = 1:1:1) and cultivated for 2 weeks. The stem length, shoot fresh weight, shoot dry weight, SPAD value and chlorophyll fluorescence (Fv/Fm) analysis of watercress were the highest in R7B3 and the lowest in R1B1G1. The photosynthesis rate and stomatal conductance showed the same tendency as watercress growth. Glucosinolate contents in watercress were the lowest at R9B1 and the highest at R7B3. R1B1G1 had a negative effect on the growth of watercress, but played a positive role in increasing the functional component. Additional key words: antioxidants, functional component, high-performance liquid chromatography, hydroponic, light quality, secondary metabolite

Effect of Red and Blue LED Ratio on Growth and Glucosinolate Contents of Watercress (Nasturtium officinale) in a Plant Factory