Blue and red light-induced changes in transcript accumulation of genes encoding cell cycle, clock and carotenoid biosynthesis components. Cell type separation and light treatments using blue (A, 470 nm; 15 μmol photons m-2 s-1) and red (B, 655 nm; 15 μmol photons m-2 s-1) light were done as described in Figure 2 and Additional file 1: Figure S1A-B. Each experiment was performed in triplicate from at least two different biological samples. The data were averaged and statistically treated (t-test, *P < 0.05; **P < 0.01). Bars show means and standard deviations.