Figure 4.

L29 mRNA levels during a day–night cycle. (Upper) Maize seedlings were grown under a 16 hr/8 hr day–night cycle for 10 days. Illumination was from 600 to 2200 daily. Leaf tissue was harvested every 2 hr. (Lower) Two sets of 10-day-old seedlings grown under the 16 hr/8 hr day–night cycle were transferred to continuous darkness at 2200 or continuous light at 600, respectively. Leaf tissue was harvested from these plants at the indicated times. The Northern blotting procedure is the same as in the experiment shown in Fig. 3.