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Anthocyanins in cornflower (Centaurea cyanus) is catalysed by a set of biosynthesis genes, however, the potential mechanism of transcriptional regulation remains unclear. In the present study, we traced the dynamic changes of petal colour development from white to violet and finally to blue on the same petal in cornflower. Pigment analysis showed that anthocyanin accumulation dramatically increased with petal colour development. Subsequently, nine libraries from above three colour regions were constructed for RNA-seq and 105,506 unigenes were obtained by de