Expression of rice Cga1 (Os02g12790). A, Expression of Cga1 in selected rice tissues. B, Expression of Cga1 at 6-h intervals throughout the course of the day (long day; 16 h of light). C, Real-time PCR of OsCga1 expression levels following periods of darkness or light and following treatment with 10 mm nitrate, 10 µmol of BA cytokinin, or 10 µmol of GA3.