Abstract
To optimize their growth and survival, plants perceive and respond to ultraviolet-B ( UV-B) radiation. However, neither the molecular identity of the UV-B photoreceptor nor the photoperception mechanism is known. Here we show that dimers of the UVR8 protein perceive UV-B, probably by a tryptophan-based mechanism. Absorption of UV-B induces instant monomerization of the photoreceptor and interaction with COP1, the central regulator of light signaling. Thereby this signaling cascade controlled by UVR8 mediates UV-B photomorphogenic responses securing plant acclimation and thus promotes survival in sunlight.
Original language | English |
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Pages (from-to) | 103-106 |
Number of pages | 4 |
Journal | Science |
Volume | 332 |
Issue number | 6025 |
DOIs | |
Publication status | Published - 1 Apr 2011 |