Fig. 2: Contents of different flavonoids in petals of “High Noon” and “Roufurong” at five blooming stages.

a “High Noon”. b “Roufurong”. Error bars represent the SE of the mean from three biological replicates. Different letters (a–d) indicate significant differences (p < 0.05) among different flavonoids by Duncan’s test. THC, tetrahydroxychalcone; Ap, apigenin; Lu, luteolin; Ch, chrysoeriol; Km, kaempferol; Qu, quercetin; Is, isorhamnetin; Pg3G, pelargonidin 3-O-glucoside; Pn3G, peonidin 3-O-glucoside; and Cy3G, cyanidin 3-O-glucoside