Fig. 3

Anthocyanin content of aGI52 and DES tubers grown under SD conditions. a Morphology of mature tubers of three aGI52 and three non-transformed, control DES plants. b The relative anthocyanin content of tuber skins determined spectrophotometrically. c The anthocyanin content of tuber skins analysed using HPLC. Abbreviations: Cya, cyanidin 3,5-di-O-glucoside; Pel, pelargonidin 3,5-di-O-glucoside; Del, delphinidin 3,5-di-glycoside. Tuber skins were peeled from 3 sets of largest tubers per line; each set contained 3 tubers. The extraction was from equal amounts of skins. The standard deviations are indicated by the error bars. Significant differences between aGI52 and DES were detected by Student’s t-test and labelled by * (p < 0.05) and ** (p < 0.01). Fw, fresh weight