Fig. 6From: Comparative analysis of cytokinin response factors in Brassica diploids and amphidiploids and insights into the evolution of Brassica speciesHierarchical clustering and heatmap representation for the expression pattern of CRFs in Brassica species with exogenous 6-BA, NAA, and ABA. The genes’ relative expression levels at 0, 0.5, and 1 h after treatment with 6-BA (a), NAA (b), and ABA(c). The CRFs in different species are marked by different colors: B. oleracea (red), B. nigra (blue), and B. napus (black). The relative expression levels of genes are presented using fold-change values transformed to Log2 formatBack to article page