Induction kinetics of N-starvation-induced genes. Leaf sheaths (a and c) and roots (b and d) of rice seedlings at six-leaf stage were harvested at 3 h, 6 h, 12 h, 1 d, and 2 d after N-starvation and -sufficient treatments were applied. NRT2.3
(a and b) and AMT2.1
(c and d) were used to investigate induction kinetics.