Takeshi Izawa and colleagues report that the rice florigen gene Hd3a, which triggers photoperiodic flowering, is toggled by a 30-minute change in day length. They report that Hd3a transcription is controlled by two gating mechanisms involving the floral promoter Ehd1 and the floral repressor Ghd7.
- Hironori Itoh
- Yasunori Nonoue
- Takeshi Izawa
