Fig. 2

Regulatory network of rice flowering time. Under short-day conditions, Hd3a is mainly up-regulated by Hd1 and Ehd1. Hd1 is up-regulated by OsGI, and Ehd1 is up-regulated by OsMADS51, whose expression is up-regulated by OsGI. OsGI is regulated by the circadian clock. Under long-day conditions, Hd1 function is converted to repress Hd3a in response to a signal from phytochrome. Ehd1 is repressed by Ghd7, a regulatory component that is up-regulated under long-day conditions, resulting in Hd3a repression. SD or LD in parentheses indicate short-day- or long-day-specific regulation, respectively.