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Mol Plant. 2014 Jun;7(6):1041-1052. doi: 10.1093/mp/ssu039. Epub 2014 Apr 7.

Photoreceptor-mediated bending towards UV-B in Arabidopsis.

Author information

1
Laboratory of Functional Plant Biology, Department of Physiology, Faculty of Sciences, Ghent University, B-9000 Ghent, Belgium. Electronic address: Filip.Vandenbussche@ugent.be.
2
Department of Botany and Plant Biology, Sciences III, University of Geneva, CH-1211 Geneva 4, Switzerland.
3
Department of Microbial and Molecular Systems, Faculty of Bioscience Engineering, KU Leuven, B-3001, Heverlee, Belgium.
4
Department of Microbial and Molecular Systems, Faculty of Bioscience Engineering, KU Leuven, B-3001, Heverlee, Belgium; Department of Plant Biotechnology and Bioinformatics, Faculty of Sciences, Ghent University, B-9000 Ghent, Belgium; Department of Information Technology, IMinds, Faculty of Sciences, Ghent University, B-9000 Ghent, Belgium.
5
Lumilab, Department of Solid State Sciences, Faculty of Sciences, Ghent University, B-9000 Ghent, Belgium.
6
Laboratory of Functional Plant Biology, Department of Physiology, Faculty of Sciences, Ghent University, B-9000 Ghent, Belgium.

Abstract

Plants reorient their growth towards light to optimize photosynthetic light capture--a process known as phototropism. Phototropins are the photoreceptors essential for phototropic growth towards blue and ultraviolet-A (UV-A) light. Here we detail a phototropic response towards UV-B in etiolated Arabidopsis seedlings. We report that early differential growth is mediated by phototropins but clear phototropic bending to UV-B is maintained in phot1 phot2 double mutants. We further show that this phototropin-independent phototropic response to UV-B requires the UV-B photoreceptor UVR8. Broad UV-B-mediated repression of auxin-responsive genes suggests that UVR8 regulates directional bending by affecting auxin signaling. Kinetic analysis shows that UVR8-dependent directional bending occurs later than the phototropin response. We conclude that plants may use the full short-wavelength spectrum of sunlight to efficiently reorient photosynthetic tissue with incoming light.

KEYWORDS:

Arabidopsis.; UV-B; UVR8; auxin; phototropism

PMID:
24711292
DOI:
10.1093/mp/ssu039
[Indexed for MEDLINE]
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