Figure 6.

UVR8-dependent acclimation to UV-B and its importance for survival under simulated sunlight. (A) Arabidopsis seedlings were grown for 7 days under white light (a, b, c; non-acclimated) or white light supplemented with narrowband UV-B (d, e, f; acclimated). Seedlings were then irradiated for 1 h (b, e) and 2 h (c, f) with broadband UV-B under a WG305 cutoff filter, or subjected to a 2 h mock treatment (a, d) under a WG345 filter (−UV-B). Treated seedlings were further grown for 7 days under standard conditions without UV-B before the picture was taken. (B) Here, 25-day-old plants grown in sunlight simulators under realistic conditions (+UV) or with the UV portion specifically filtered out (−UV). (C) Close up of 27-day-old single plants grown under +UV conditions. WT=Ws/Pro_HY5:Luc+, Ox no. 2/no. 3=Pro_35S:UVR8 in WT, lines 2 and 3.