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Published on November 30, 2007; 10.1104/pp.107.108456

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Received August 31, 2007
Accepted November 21, 2007

UV-B Signaling Pathways with Different Fluence Rate Response Profiles are Distinguished in Mature Arabidopsis Leaf Tissue by Requirement for UVR8, HY5 and HYH

Bobby A. Brown and Gareth I. Jenkins *

Plant Science Group, Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK

* Corresponding author; email: G.Jenkins{at}bio.gla.ac.uk.

UV-B signaling is an important but poorly understood aspect of light responsiveness in plants. Arabidopsis thaliana UV RESISTANCE LOCUS8 (UVR8) is a recently identified UV-B-specific signaling component that regulates UV-protective responses. Using the uvr8 mutant we defined genetically distinct UVR8-dependent and UVR8-independent pathways that stimulate different sets of genes in mature Arabidopsis leaf tissue. Both pathways operate at 1 µmol m-2 s-1 UV-B and above, but the UVR8-dependent pathway is able to stimulate UV-protective genes even in response to 0.1 µmol m-2 s-1 UV-B. Both pathways function in mutants lacking either the phytochromes, cryptochromes or phototropins. Genes encoding the ELONGATED HYPOCOTYL5 (HY5) and HY5 HOMOLOG (HYH) transcription factors are induced at low UV-B fluence rates (0.1 µmol m-2 sec-1). Experiments with hy5 and hyh mutants reveal that both these factors mediate responses of the UVR8-dependent pathway, acting with partial or complete redundancy to stimulate expression of particular genes. Furthermore, evidence is presented that all UVR8 pathway genes are likely to be regulated by HY5/HYH and that these transcription factors do not mediate UV-B responses independent of UVR8. Finally, we highlight the functions of HY5 and HYH in UV-protection and show that HY5 plays the more critical role. This research provides evidence that in UV-B signaling UVR8, HY5 and HYH act together in a photoregulatory pathway and demonstrates a new role for HYH in UV-B responses.




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