Title
Ultraviolet-B radiation stimulates downward leaf curling in **Arabidopsis thaliana** Ultraviolet-B radiation stimulates downward leaf curling in **Arabidopsis thaliana**
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Paris ,
Subject
Biology
Source (journal)
Plant physiology and biochemistry. - Paris, 1987, currens
Volume/pages
93(2015) , p. 9-17
ISSN
0981-9428
ISI
000357223100003
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Plants are very well adapted to growth in ultraviolet-B (UV-B) containing light. In Arabidopsis thaliana, many of these adaptations are mediated by the UV-B receptor UV RESISTANCE LOCUS 8 (UVR8). Using small amounts of supplementary UV-B light, we observed changes in the shape of rosette leaf blades. Wild type plants show more pronounced epinasty of the blade edges, while this is not the case in uvr8 mutant plants. The UVR8 effect thus mimics the effect of phytochrome (phy) B in red light. In addition, a meta-analysis of transcriptome data indicates that the UVR8 and phyB signaling pathways have over 70% of gene regulation in common. Moreover, in low levels of supplementary UV-B light, mutant analysis revealed that phyB signaling is necessary for epinasty of the blade edges. Analysis of auxin levels and the auxin signal reporter DR5::GUS suggest that the epinasty relies on altered auxin distribution, keeping auxin at the leaf blade edges in the presence of UV-B. Together, our results suggest a co-action of phyB and UVR8 signaling, with auxin as a downstream factor.
E-info
https://repository.uantwerpen.be/docman/iruaauth/27bba7/ab9d6c18327.pdf
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