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Coordinated regulation of Arabidopsis thaliana development by light and gibberellins
This work characterize a nuclear protein interaction cascade mediating transduction of GA signals to the activity regulation of a light-responsive transcription factor in the presence of GA, and releases PIF3 from the negative effect of DELLA proteins. Expand
Perception of UV-B by the Arabidopsis UVR8 Protein
It is shown that dimers of the UVR8 protein perceive UV-B, probably by a tryptophan-based mechanism, which mediatesUV-B photomorphogenic responses securing plant acclimation and thus promotes survival in sunlight. Expand
Constitutive Photomorphogenesis 1 and Multiple Photoreceptors Control Degradation of Phytochrome Interacting Factor 3, a Transcription Factor Required for Light Signaling in Arabidopsis
It is proposed that PIF3 acts transiently, and its major function is to mediate phytochrome-induced signaling during the developmental switch from skotomorphogenesis to photomorphogenesis and/or dark to light transitions. Expand
Photoactivated phytochrome induces rapid PIF3 phosphorylation prior to proteasome-mediated degradation.
It is suggested that phy-induced phosphorylation of proteins such as PIF3 may represent the primary intermolecular signaling transaction of the activated photoreceptor, tagging the target protein for proteosomal degradation, possibly in nuclear speckles. Expand
Genome-wide analysis of gene expression reveals function of the bZIP transcription factor HY5 in the UV-B response of Arabidopsis.
  • R. Ulm, A. Baumann, +5 authors F. Nagy
  • Biology, Medicine
  • Proceedings of the National Academy of Sciences…
  • 3 February 2004
This work monitors the gene expression profile of UV-B-irradiated seedlings by using high-density oligonucleotide microarrays and demonstrates that the bZIP transcription factor HY5 is required for UV- B-mediated regulation of a subset of genes. Expand
CONSTITUTIVELY PHOTOMORPHOGENIC1 Is Required for the UV-B Response in Arabidopsis[W]
It is concluded that COP1 performs a specific and novel role in the plants' photomorphogenic response to UV-B, coordinating HY5-dependent and -independent pathways, which eventually results inUV-B tolerance. Expand
Light Quality–Dependent Nuclear Import of the Plant Photoreceptors Phytochrome A and B
Light-regulated nucleocytoplasmic partitioning of phyA and phyB is a major step in phytochrome signaling, and observations indicate that nuclear import ofphyA–GFP is controlled by a very low fluence response, whereas translocation ofPhyB–G FP is regulated by a low fluences response of phYtochrome. Expand
Phytochromes function as thermosensors in Arabidopsis
A major thermosensory role for the phytochromes (red light receptors) during the night is described, and it is found that phy tochrome B directly associates with the promoters of key target genes in a temperature-dependent manner. Expand
Nucleocytoplasmic Partitioning of the Plant Photoreceptors Phytochrome A, B, C, D, and E Is Regulated Differentially by Light and Exhibits a Diurnal Rhythm Article, publication date, and citation
The results suggest that the differential regulation of the translocation of phytochrome A to E into nuclei plays a role in the specification of functions, and the appearance of speckles is a functional feature of phYtochrome-regulated signaling. Expand
FHY1 and FHL act together to mediate nuclear accumulation of the phytochrome A photoreceptor.
FHL accounts for residual amounts of phyA in the nucleus in a fhy1 background and that nuclear accumulation ofphyA is completely inhibited in an fhy2 FHL RNAi knock-down line, and it is demonstrated that FHL and phYA interact with each other in a light-dependent manner and that they co-localize in light-induced nuclear speckles. Expand