Figure 5.

Greater than 12 h of darkness after the R light exposure was required for the increase in PAT to occur. When the dark period following 10 μmol m⁻² R light exposure equaled or exceeded 15 h, PAT was significantly increased in etiolated tomato seedlings (P < 0.005, n = 10, Student’s t test). A similar result was also obtained using 3,000 μmol m⁻² B light exposure (Supplemental Fig. S1A). [See online article for color version of this figure.]