Fig 3. Total concentrations of phenolic acids, flavonols, and flavan-3-ols in grapes under the two treatments.

(A), (B), and (C) represents the concentrations of phenolic acids (hydroxybenzoic acids and hydroxycinnamic acids), various substituted flavonols, and flavan-3-ols in grape berries, respectively, under rain-shelter and open-field cultivation in 2012 and 2013. F3H: flavonoid 3-hydroxylase; F3’H: flavonoid 3’-hydroxylase; F3’5’H: flavonoid 3’5’-hydroxylase. * represents a significant difference in the concentrations between the two types of cultivation (p<0.05).