Figure 2.

Relationship between the hypocotyl length and the photon fluence of FR light per pulse. A, Light regime. Two-day-old etiolated seedlings of the wild type were transferred and grown in the intermittent irradiation with different intensities of FR light for different durations of exposure time in 3-min cycles for 5 d, and their hypocotyl lengths were measured. White bars, FR light pulses with LEDs; black bars, darkness. B, Responses to intermittent irradiation with FR light pulses for 1 s (⋄), 3 s (▵), 10 s (□), and 60 s (○) in the wild type (top graph) and the phyB mutant (bottom graph). Error bars represent se.