REPRESSOR OF ULTRAVIOLET-B PHOTOMORPHOGENESIS function allows efficient phototropin mediated ultraviolet-B phototropism in etiolated seedlings.

Details

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State: Public
Version: Author's accepted manuscript
Serval ID
serval:BIB_D93A0C6693F2
Type
Article: article from journal or magazin.
Collection
Publications
Title
REPRESSOR OF ULTRAVIOLET-B PHOTOMORPHOGENESIS function allows efficient phototropin mediated ultraviolet-B phototropism in etiolated seedlings.
Journal
Plant science : an international journal of experimental plant biology
Author(s)
Vanhaelewyn L., Schumacher P., Poelman D., Fankhauser C., Van Der Straeten D., Vandenbussche F.
ISSN
1873-2259 (Electronic)
ISSN-L
0168-9452
Publication state
Published
Issued date
11/2016
Peer-reviewed
Oui
Volume
252
Pages
215-221
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
Ultraviolet B (UV-B) light is a part of the solar radiation which has significant effects on plant morphology, even at low doses. In Arabidopsis, many of these morphological changes have been attributed to a specific UV-B receptor, UV resistance locus 8 (UVR8). Recent findings showed that next to phototropin regulated phototropism, UVR8 mediated signaling is able of inducing directional bending towards UV-B light in etiolated seedlings of Arabidopsis, in a phototropin independent manner. In this study, kinetic analysis of phototropic bending was used to evaluate the relative contribution of each of these pathways in UV-B mediated phototropism. Diminishing UV-B light intensity favors the importance of phototropins. Molecular and genetic analyses suggest that UV-B is capable of inducing phototropin signaling relying on phototropin kinase activity and regulation of NPH3. Moreover, enhanced UVR8 responses in the UV-B hypersensitive rup1rup2 mutants interferes with the fast phototropin mediated phototropism. Together the data suggest that phototropins are the most important receptors for UV-B induced phototropism in etiolated seedlings, and a RUP mediated negative feedback pathway prevents UVR8 signaling to interfere with the phototropin dependent response.

Keywords
Arabidopsis/growth & development, Arabidopsis/metabolism, Arabidopsis/radiation effects, Arabidopsis Proteins/genetics, Arabidopsis Proteins/metabolism, Arabidopsis Proteins/physiology, Chromosomal Proteins, Non-Histone/genetics, Chromosomal Proteins, Non-Histone/metabolism, Chromosomal Proteins, Non-Histone/physiology, Kinetics, Light Signal Transduction, Phototropins/genetics, Phototropins/metabolism, Phototropins/physiology, Phototropism, Seedlings/growth & development, Seedlings/metabolism, Seedlings/radiation effects, Ultraviolet Rays
Pubmed
Web of science
Open Access
Yes
Create date
19/10/2016 13:30
Last modification date
20/08/2019 16:58
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