Figure 4.

Effects of GA and chilling temperatures on EOD-FR-mediated elongation response. Mock-, GA₃-, and PBZ-treated B73 wild-type and phyB1 phyB2 double mutant seedlings were used. A, Seedlings were grown at a constant temperature of 28°C, and measurements were taken 10 d after planting. B, Seedlings were subjected to a nightly chilling temperature of 10°C and grown at 28°C during the photoperiod. Measurements were taken 20 d after planting. The values are representative means ± se. The number of seedlings measured for W/EOD-FR are shown below each treatment. Asterisks indicate Student’s t test significant differences between the two light treatments for each line (* P < 0.05, ** P < 0.01, *** P < 0.001).