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Multivariate principal component analysis showing how different photoperiods enhanced quality of cabbage (A) and Chinese kale (B): DW (dry weight), ChlA (Chlorophyll a), Chl B (Chlorophyll b), Total chl (total chlorophyll), Caro (carotenoids), Phe (phenolic), Pro (soluble protein), Fla (flavonoids), VC (vitamin C), Sugar (soluble sugar), HL (hypocotyl length), Nit (nitrate), FW (fresh weight).
