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Effects of two treatments on (A) anthocyanin content, (B) proanthocyanidin content, (C) total flavonoids content and (D) total phenolics content during light cultivation of ‘Red Delicious’ apples. Error bars, mean ± standard error (n = 3). Different letters indicate significant differences among treatments in the same period using Duncan’s test (p < 0.05), n.s. represents no significant difference (p ≥ 0.05).
