Journal ArticleDOI
Photoreceptors in Arabidopsis thaliana: light perception, signal transduction and entrainment of the endogenous clock.
TLDR
Recent insights into photosensory transduction mechanisms as well as on the current understanding of light entrainment of the endogenous clock are focused on.Abstract:
To keep track of fluctuations in spectral composition and intensity of incoming sunlight, plants engage a plethora of photosensory pigments. Absorption of light by these photoreceptors sets in motion signaling cascades that ultimately influence the plant's physiology. Many light-controlled processes are based on modulation of gene activity in response to changes in irradiation. The molecular basis of this regulation and the downstream components transducing signals from the photoreceptors are not fully understood yet, but recent evidence suggests that some of those routes are rather short. The phytochrome photoreceptors have been found to influence light-responsive promoters by direct contact with transcription factors. Additionally, the cryptochrome blue-light receptors directly interact with a key repressor of photomorphogenesis, suggesting that light activation of photoreceptors could initiate photomorphogenesis through posttranslational regulation. This review focuses on recent insights into photosensory transduction mechanisms as well as on our current understanding of light entrainment of the endogenous clock.read more
Citations
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Journal ArticleDOI
Light Signal Transduction in Higher Plants
TL;DR: Plants utilize several families of photoreceptors to fine-tune growth and development over a large range of environmental conditions, and the molecular mechanisms involved include light-regulated subcellular localization of the photoreception, a large reorganization of the transcriptional program, and light- regulated proteolytic degradation of several photoreceptor and signaling components.
Journal ArticleDOI
Ultraviolet-B radiation-mediated responses in plants. Balancing damage and protection
TL;DR: Seven percent of the electromagnetic radiation emitted from the sun is in the UV range (200–400 nm).
Journal ArticleDOI
Extension of a genetic network model by iterative experimentation and mathematical analysis
James C. W. Locke,Megan M Southern,László Kozma-Bognár,László Kozma-Bognár,Victoria Hibberd,Paul E. Brown,Paul E. Brown,Matthew S. Turner,Andrew J. Millar,Andrew J. Millar +9 more
TL;DR: Analysis of the model predicted the properties of these components, including an acute light induction at dawn that is rapidly repressed by LHY and CCA1, and found this unexpected regulation in RNA levels of the evening‐expressed gene GIGANTEA (GI), supporting the proposed network and making GI a strong candidate for this component.
Journal ArticleDOI
PIL5, a phytochrome-interacting basic helix-loop-helix protein, is a key negative regulator of seed germination in Arabidopsis thaliana.
TL;DR: It is reported here that the PIF3-like 5 (PIL5) protein, a basic helix-loop-helix transcription factor, is a key negative regulator of phytochrome-mediated seed germination, and the data identify PIL5 as the first Phy-interacting protein that regulates seed Germination.
Journal ArticleDOI
Light activates the degradation of PIL5 protein to promote seed germination through gibberellin in Arabidopsis
TL;DR: The data indicate that phytochromes promote seed germination by degrading PIL5, which leads to increased GA biosynthesis and decreased GA degradation.
References
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Journal ArticleDOI
Molecular Bases for Circadian Clocks
TL;DR: It used to be that research in chronobiology moved biochemical functions [transcriptional activators], the along at a gentlemanly pace, but by mid 1997 the word in determining what the authors perceive as time was PASWCCLK.
Journal ArticleDOI
Orchestrated Transcription of Key Pathways in Arabidopsis by the Circadian Clock
Stacey L. Harmer,John B. Hogenesch,Marty Straume,Hur-Song Chang,Bin Han,Tong Zhu,Xun Wang,Joel A. Kreps,Steve A. Kay,Steve A. Kay +9 more
TL;DR: This study presents a comprehensive view of the temporal compartmentalization of physiological pathways by the circadian clock in a eukaryote.
Journal ArticleDOI
Hd1, a Major Photoperiod Sensitivity Quantitative Trait Locus in Rice, Is Closely Related to the Arabidopsis Flowering Time Gene CONSTANS
Masahiro Yano,Yuichi Katayose,Motoyuki Ashikari,Utako Yamanouchi,Lisa Monna,Takuichi Fuse,Tomoya Baba,Kimiko Yamamoto,Yosuke Umehara,Yoshiaki Nagamura,Takuji Sasaki +10 more
TL;DR: It is suggested that Hd1 functions in the promotion of heading under short- day conditions and in inhibition under long-day conditions and is a homolog of CONSTANS in Arabidopsis.
Journal ArticleDOI
Activation Tagging Identifies a Conserved MYB Regulator of Phenylpropanoid Biosynthesis
TL;DR: A novel approach for enhancing the accumulation of natural products based on activation tagging by Agrobacterium-mediated transformation with a T-DNA that carries cauliflower mosaic virus 35S enhancer sequences at its right border is reported.
Journal ArticleDOI
Mammalian Cry1 and Cry2 are essential for maintenance of circadian rhythms.
Gijsbertus T. J. van der Horst,Manja Muijtjens,Kumiko Kobayashi,Riya Takano,Shin Ichiro Kanno,Masashi Takao,Jan de Wit,Anton Verkerk,André P. M. Eker,Dik van Leenen,Ruud M. Buijs,Dirk Bootsma,Jan H.J. Hoeijmakers,Akira Yasui +13 more
TL;DR: It is shown that mice lacking the Cry1 or Cry2 protein display accelerated and delayed free-running periodicity of locomotor activity, respectively, which suggests that, in addition to a possible photoreceptor and antagonistic clock-adjusting function, both proteins are essential for the maintenance of circadian rhythmicity.