Fig. 1. The phenotypes and seed numbers of different genotypes of Malus plants.

a, b White flower genotypes: 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’. c, d WT, wild type of M. domestica ‘Royal Gala’; A1/3, transgenic line with MdMYB10 overexpression of ‘Royal Gala’. a, c Bars = 1 cm. b, d White bars represent white flower genotypes and red bars represent red flower genotypes; data are presented as mean ± SE (n = 5); “*” and “**” mean significant difference between the white flower and the red flower genotypes at P < 0.05 and at P < 0.01, respectively, t-test