Fig. 4

Expression profiles of 16 selected PbCCT genes under varying light signal environments. The Y-axes show the relative gene expression level under blue light treatment (blue bars, left) and the relative gene expression level under red light treatment (red line, right). B1000/1500/2000/2500/3000/3500 (x-axis) indicate six blue light intensity gradients, i.e., 1000 lx, 1500 lx, 2000 lx, 2500 lx, 3000 lx and 3500 lx. R500/1000/1500/2000/2500/3000 (x-axis) indicate six red light intensity gradients, i.e., 500 lx, 1000 lx, 1500 lx, 2000 lx, 2500 lx and 3000 lx. Error bars indicate the standard deviation from three biological replicates by qRT–PCR analysis. Different capital letters indicate significant differences at P < 0.01