(Right) In LD conditions, Hd1 function is converted into a repressor of Hd3a expression. This process is specifically evoked during LD by the
coincidence of the clock-regulated Hd1 expression and phytochrome-mediated light signaling. Hd6 CK2alpha enhances the repressor activity. Ghd7,
a CCT-motif protein, represses Ehd1 expression in LD conditions to delay flowering. Ghd7 expression is induced by phytochrome-mediated red light
signaling in the morning of LD, but this timing shifts to midnight in SD conditions. Although LD is the suppressive condition for rice flowering, thereis a
LD-specific flowering promotion pathway in rice. OsMADS50 activates Ehd1 expression, and in turn Ehd1 activates RFT1 expression. RFT1 acts as the
LD-specific florigen