Fig. 1

Feedback loops of the Arabidopsis clock. Simplified schematic diagram of the 24-h Arabidopsis clock. Feedback loops of the core clock genes are represented in the centre. Full lines represent transcriptional feedback loops, whereas dashed lines represent post-translational regulation. Arrows represent activation, while arrows with blunt ends represent repression. The diagram represents a compilation of gene regulation from numerous publications referred to in the “Introduction”. For simplicity, the PRR3 component was not included in the above regulatory network. Expression peaks of clock genes are represented at different times of the day and night in the outer circle (Nakamichi 2011)