Fig. 5

Heatmap of expression level of 60 PbrLBD genes at six different tissues, including stem, ovary, petal, sepal, fruit and leaf. Based on the result of phylogenetic tree (Fig. 1a), the LBD gene family was divided into seven subgroups: class Ia, class Ib, class Ic, class Id, class IIa, class IIb. The heatmaps were plotted by heatmap.2, a function of the gplots package in R. Red color indicates high expression and blue indicates low expression. The color scale at the top right indicates RPKM (reads per kilobase per million) values normalized by log2