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Photoreceptor-Mediated Bending towards UV-B in Arabidopsis

Vandenbussche, Filip
Fierro, Ana Carolina
Marchal, Kathleen
Poelman, Dirk
Van Der Straeten, Dominique
Published in Molecular Plant. 2014, vol. 7, no. 6, p. 1041-1052
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 PhototropismUV-BAuxinUVR8Arabidopsis
PMID: 24711292
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VANDENBUSSCHE, Filip et al. Photoreceptor-Mediated Bending towards UV-B in Arabidopsis. In: Molecular Plant, 2014, vol. 7, n° 6, p. 1041-1052. https://archive-ouverte.unige.ch/unige:37189

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Deposited on : 2014-06-04

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