The rice counterpart of the GI-CO-FT pathway is composed of their orthologous proteins, OsGI-Heading date1
(Hd1)-Hd3a, that is active only in SD but is modified to
change its activity during LD (Figure 1). OsGIwas
identified by the differential display approach, and subsequent functional analysis revealed it as an activator of
Hd1 expression [12
,20]. Arabidopsis GI participates with