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Title: Photoreceptor-Mediated Bending towards UV-B in Arabidopsis
Authors: Vandenbussche, Filip ×
Tilbrook, Kimberley
Fierro, Ana Carolina
Marchal, Kathleen
Poelman, Dirk
Van Der Straeten, Dominique
Ulm, Roman #
Issue Date: Jun-2014
Publisher: Oxford University Press
Series Title: Molecular Plant vol:7 issue:6 pages:1041-52
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 signalling. 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.
URI: 
ISSN: 1674-2052
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre of Microbial and Plant Genetics
× corresponding author
# (joint) last author

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