Plant Response to UV-B: From Tolerance to Toxicity

Abstract

In higher plants, UV-B is known to have two very diverse effects: one in response to the evoked damage and the other in response to the perception of UV-B by postulated receptor, leading to UV-B-induced photomorphogenesis and thus acclimation. The UV-B-specific pathway involves the UVR8-COP1-HY5 pathway. The response depends on wavelength, fluence rate, and duration of the UV-B radiation as well as the extent of adaptation. On the other hand, the damage response pathway includes activation of more general stress responses.