Figure 5.

Expression of signature genes during dark arrest and subsequent light exposure in young leaf primordia. The dark arrest blocks the cell proliferation and growth genetic program and activates starvation genetic responses. Light reverses these and brings about hormonal resetting. Wild-type seedlings were gown in light on Suc-containing plates, transferred to dark, and returned to light under conditions and times identical to those for Figure 4 or after 8 d in continuous light. Seedlings harvested at the corresponding times had the primordia of leaves 1 and 2 dissected, and the expression of the genes shown, representing the biological process indicated above each graph and in Table I, was monitored by quantitative real-time PCR. Error bars indicate se (between biological replicates).