Fig. 3. Flavonoid compounds concentration in different tissues of Malus germplasm resources.

1, M. hupehensis; 2, M. micromalus; 3, M. halliana; 4, M. baccata; 5, M. domestica ‘Golden Delicious’; 6, M. domestica ‘Fuji’; 7, M. domestica ‘Red Delicious’; 8, M. domestica ‘Gala’; and red flower genotypes: 9, M. ‘Sparkler’; 10, M. ‘Radiant’; 11, M. ‘Adams’; 12, M. ‘Kelsey’; 13, M. ‘Perfect Purple’; 14, M. ‘Royalty’. C1: cyanidin 3-O-galactoside; K1, kaempferol 3-O-xyloside; K2, kaempferol 3-O-arabinoside; K3, kaempferol 3-O-rhamnoside; Q1: quercetin 3-O-galactoside; Q2: quercetin 3-O-glucoside; Q3: quercetin 3-O-xyloside; Q4: quercetin 3-O-arabinoside; and Q5: quercetin 3-O-rhamnoside. The flower petals were collected at stage 1 as described in the materials and methods. Data are presented as the average of five replicates