Relationship between external and internal cues to regulate the phase of the barley transcriptome. A, Fractions of transcripts identified as clock-dominated, co-dominated by the clock and light, and light-dominated by the Bode analysis. B, Phase relationships among diel cycles (LD) and constant light (LL) for all transcripts oscillating in LD and LL, those co-regulated by the circadian clock, those dominated by the circadian clock, and those that are dominated by light. C, Phase distribution of co-regulated, clock-dominated, and light-dominated transcripts in LD.