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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.
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.
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.
Photoactivated phytochrome induces rapid PIF3 phosphorylation prior to proteasome-mediated degradation.
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.
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, F. Nagy
- Environmental ScienceProceedings 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.
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.
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.
FHY1 and FHL act together to mediate nuclear accumulation of the phytochrome A photoreceptor.
- A. Hiltbrunner, Anke Tscheuschler, András Viczián, T. Kunkel, S. Kircher, E. Schäfer
- Environmental Science, BiologyPlant and Cell Physiology
- 1 August 2006
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.
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.