Figure 1.

Gene regulatory networks controlling rice photoperiodic flowering.

The networks represent the transcriptional relationships that take place under LDs and SDs. Regulatory signals ultimately converge on Ehd1 and florigen transcription. Genes indicated in purple act as flowering inhibitors, and those in green act as promoters. Genes indicated in bold have a stronger impact on flowering time, as inferred from the effects of their corresponding loss-of-function mutants. Some positive and negative regulators of Ehd1 and Ghd7 have been grouped in boxes to simplify graphical representation. Arrows and flat-ended arrows indicate transcriptional activation and repression, respectively. The interaction of light with gene expression is indicated by lightning symbols.