Relative expression of FNS II in the petals of differently coloured dahlia cultivars. FNS II expression was measured in comparison to the housekeeping genes Actin (left) GAPDH (right) in the white cv. White Alva (1), yellow cvs. Rubens (2) Alva’s Supreme (3), red cvs. Feuerschein (4), Cheerio (5) and black cvs. Arabian Night (6), Auroras Kiss (7), Black Jack (8), Charles de Gaulle (9), Chat Noir (10), Karma Choc (11), Magic Night (12), Meteor (13), Mythos (14), Negerkopf (15), Tisa (16), Black Barbara (17). The relative gene expression was calculated in comparison to the red cv. Feuerschein.