Figure 2.

The circadian clock in B. rapa callus is entrained to light/dark cycles. Populations of callus derived from B. rapa R500 hypocotyl explants were grown in cycles of either 12 h of light and 12 h of dark (white circles) or 12 h of dark and 12 h of light (black squares) prior to release into continuous light at time zero. pCCA1:LUC expression was monitored for 6 d. For clarity, only every fourth data point is shown. The entraining light/dark cycles are indicated by the alternating white and black bars below (light/dark) or above (dark/light) the data.