Schematic of phenotypic and physiological data among different shading treatments of capitulum developmental stages. A, The different developmental stages of the capitulum before treatment and the corresponding ray floret phenotypes at the S5 developmental stage of the capitulum. Scale bar = 1 cm. B, Comparison of CIRG values and relative anthocyanin contents in ray florets (S5 developmental stage of the capitulum) among different treatments. a represents the control group (capitulum treated under light condition from stage S1 until stage S5), while b, c, d and e represent capitulum treated under dark conditions from stages S1 to S4, respectively, until developed to stage S5.