Figure 2.

Root growth of uvr2-1 is affected by UV-B during recovery in the light, but not in the dark. Three-day-old seedlings were treated with 0.22–2.62 kJ·m⁻² unweighted UV-B (1.32 kJ·m⁻²·min⁻¹) from a transilluminator followed by 24 hr incubation under CW1500 cool-white lamps with mylar filtration or in the dark, to allow new root growth. (A) WT. (B) uvr2-1. (C) uvr1. Open symbols, light; solid symbols, dark. Standard error is indicated with vertical lines. Data are the means of three experiments with root growth normalized to that of untreated plants.