Figure 4.

son1 affects circadian clock gene expression in light/dark cycles and constant light. A, CCA1, PRR7, TOC1, and CHE expression from son1 (red) and Ws-2 (white) samples harvested immediately preceding dawn and dusk. Asterisks represents significance at P < 0.01 with Student’s t test. Relative expression of genes normalized to UBQ10f expression is given ± sd (n = 3). B, CCA1, PRR7, TOC1, and CHE expression from Ws-2 and son1 in the absence (left) and presence (right) of 20 mm nicotinamide across 48 h in constant 70 µmol m⁻² s⁻¹ light from ZT24 to ZT72. Relative expression of genes normalized to UBQ10f expression is given ± sd (n = 3). Plants were grown as clusters of five plants for 11 d in light/dark cycles prior to the experiment.