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  • 1
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    A molecular framework for light and gibberellin control of cell elongation (2008)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2008-01-25
    Description: Cell elongation during seedling development is antagonistically regulated by light and gibberellins (GAs). Light induces photomorphogenesis, leading to inhibition of hypocotyl growth, whereas GAs promote etiolated growth, characterized by increased hypocotyl elongation. The mechanism underlying this antagonistic interaction remains unclear. Here we report on the central role of the Arabidopsis thaliana nuclear transcription factor PIF4 (encoded by PHYTOCHROME INTERACTING FACTOR 4) in the positive control of genes mediating cell elongation and show that this factor is negatively regulated by the light photoreceptor phyB (ref. 4) and by DELLA proteins that have a key repressor function in GA signalling. Our results demonstrate that PIF4 is destabilized by phyB in the light and that DELLAs block PIF4 transcriptional activity by binding the DNA-recognition domain of this factor. We show that GAs abrogate such repression by promoting DELLA destabilization, and therefore cause a concomitant accumulation of free PIF4 in the nucleus. Consistent with this model, intermediate hypocotyl lengths were observed in transgenic plants over-accumulating both DELLAs and PIF4. Destabilization of this factor by phyB, together with its inactivation by DELLAs, constitutes a protein interaction framework that explains how plants integrate both light and GA signals to optimize growth and development in response to changing environments.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉de Lucas, Miguel -- Daviere, Jean-Michel -- Rodriguez-Falcon, Mariana -- Pontin, Mariela -- Iglesias-Pedraz, Juan Manuel -- Lorrain, Severine -- Fankhauser, Christian -- Blazquez, Miguel Angel -- Titarenko, Elena -- Prat, Salome -- England -- Nature. 2008 Jan 24;451(7177):480-4. doi: 10.1038/nature06520.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departamento de Genetica Molecular de Plantas, Centro Nacional de Biotecnologia-CSIC, Campus Univ. Autonoma de Madrid, Cantoblanco. c/ Darwin 3, 28049 Madrid, Spain.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18216857" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/cytology/*drug effects/metabolism/*radiation effects ; Arabidopsis Proteins/chemistry/genetics/*metabolism ; Basic Helix-Loop-Helix Transcription Factors/chemistry/genetics/metabolism ; Cell Shape/*drug effects/*radiation effects ; Cell Size/drug effects/radiation effects ; DNA, Plant/metabolism ; Gibberellins/*pharmacology ; Hypocotyl/genetics/growth & development/metabolism ; *Light ; Nuclear Proteins/chemistry/genetics/metabolism ; Phytochrome B/genetics/metabolism ; Plant Leaves/metabolism ; Protein Binding ; Seedlings/metabolism ; Signal Transduction/drug effects ; Tobacco/metabolism ; Triazoles/pharmacology ; Two-Hybrid System Techniques
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 2
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    An Arabidopsis gene regulatory network for secondary cell wall synthesis (2014)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2014-12-24
    Description: The plant cell wall is an important factor for determining cell shape, function and response to the environment. Secondary cell walls, such as those found in xylem, are composed of cellulose, hemicelluloses and lignin and account for the bulk of plant biomass. The coordination between transcriptional regulation of synthesis for each polymer is complex and vital to cell function. A regulatory hierarchy of developmental switches has been proposed, although the full complement of regulators remains unknown. Here we present a protein-DNA network between Arabidopsis thaliana transcription factors and secondary cell wall metabolic genes with gene expression regulated by a series of feed-forward loops. This model allowed us to develop and validate new hypotheses about secondary wall gene regulation under abiotic stress. Distinct stresses are able to perturb targeted genes to potentially promote functional adaptation. These interactions will serve as a foundation for understanding the regulation of a complex, integral plant component.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4333722/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4333722/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Taylor-Teeples, M -- Lin, L -- de Lucas, M -- Turco, G -- Toal, T W -- Gaudinier, A -- Young, N F -- Trabucco, G M -- Veling, M T -- Lamothe, R -- Handakumbura, P P -- Xiong, G -- Wang, C -- Corwin, J -- Tsoukalas, A -- Zhang, L -- Ware, D -- Pauly, M -- Kliebenstein, D J -- Dehesh, K -- Tagkopoulos, I -- Breton, G -- Pruneda-Paz, J L -- Ahnert, S E -- Kay, S A -- Hazen, S P -- Brady, S M -- R01 GM056006/GM/NIGMS NIH HHS/ -- R01 GM107311/GM/NIGMS NIH HHS/ -- R01GM056006/GM/NIGMS NIH HHS/ -- R01GM107311/GM/NIGMS NIH HHS/ -- R25 GM056765/GM/NIGMS NIH HHS/ -- RC2 GM092412/GM/NIGMS NIH HHS/ -- RC2GM092412/GM/NIGMS NIH HHS/ -- England -- Nature. 2015 Jan 29;517(7536):571-5. doi: 10.1038/nature14099. Epub 2014 Dec 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Department of Plant Biology, University of California Davis, One Shields Avenue, Davis, California 95616, USA [2] Genome Center, University of California Davis, One Shields Avenue, Davis, California 95616, USA. ; Biology Department, University of Massachusetts, Amherst, Massachusetts 01003, USA. ; Department of Plant and Microbial Biology, University of California Berkeley, Berkeley, California 94720, USA. ; Department of Plant Biology, University of California Davis, One Shields Avenue, Davis, California 95616, USA. ; Department of Plant Sciences, University of California Davis, One Shields Avenue, Davis, California 95616, USA. ; 1] Genome Center, University of California Davis, One Shields Avenue, Davis, California 95616, USA [2] Department of Computer Science, University of California Davis, One Shields Avenue, Davis, California 95616, USA. ; Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA. ; 1] Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA [2] US Department of Agriculture, Agricultural Research Service, Ithaca, New York 14853, USA. ; Section of Cell and Developmental Biology, Division of Biological Sciences, University of California San Diego, La Jolla, California 92093, USA. ; Theory of Condensed Matter Group, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25533953" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/*genetics/growth & development/*metabolism ; Arabidopsis Proteins/genetics/metabolism ; Cell Wall/*metabolism ; DNA, Plant/genetics/metabolism ; E2F Transcription Factors/metabolism ; Feedback ; Gene Expression Regulation, Developmental/genetics ; Gene Expression Regulation, Plant/*genetics ; Gene Regulatory Networks/*genetics ; Iron/deficiency ; Organ Specificity ; Promoter Regions, Genetic/genetics ; Reproducibility of Results ; Salinity ; Time Factors ; Transcription Factors/*metabolism ; Xylem/genetics/growth & development/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 3
    Electronic Resource
    Electronic Resource
    New setup for end-fire coupling excitation of planar waveguides at low temperatures (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 2275-2278 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This work describes a new experimental setup for end-fire coupling excitation of planar waveguides in the 300–10 K temperature range, which allows us to analyze their optical and spectroscopic properties through different techniques such as transmission, luminescence, or waveguide Raman spectroscopy. Two main novelties are relevant in this setup; (1) the use of long working distance microscope objectives, placed out of the cryostat, for both coupling and collecting guided light, and (2) the original set of mirrors, combined with different translation and rotation stages, which allows fine x,y,z,θ displacements of the beam focusing point preserving the laser beam alignment along the optical axis of the coupling objective. The setup has been tested in a series of Nd3+ doped ZBLA (ZrF4-BaF2-LaF3-AlF3) fluoride glass channel waveguides (from 2 to 40 μm width and 2 μm depth) obtained by ion-exchange and photolithography methods. The Nd3+ guided luminescence has been analyzed at low temperatures and compared to the spectra obtained for the bulk substrate. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148136
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  • 4
    Electronic Resource
    Electronic Resource
    Infrared luminescence decay and guided spectroscopy of Er3+ doped CaF2 molecular beam epitaxy layers (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 3345-3349 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The decay of infrared luminescence in Er3+-doped CaF2 layers grown by molecular beam epitaxy (MBE) on CaF2 substrates has been studied as a function of the Er3+ concentration in the 0.05–35 mol % range. Excitations at 800 nm, 980 nm, and 1.48 μm were used to obtain the decay of the 4I13/2→4I15/2 luminescence at 1.54 μm. The results have been compared with those reported for the Er3+ doped CaF2 bulk and correlated with the low temperature luminescence study of these layers in a back-scattering configuration. The 4I13/2 level lifetime was found to be almost constant (∼11 ms) for Er3+ concentrations up to 5 mol %. At higher concentrations, the lifetime decreases due to energy transfer, but remains longer than the lifetime measured in the bulk because of the different formation of aggregated centers induced by the MBE growth conditions. The strong increase of the luminescence intensity observed from 10 to 35 mol % Er3+ concentrations despite the decrease of the lifetime is discussed. Finally, end-fire coupling of a diode laser at 977 nm and propagation through 15 mm long waveguides have been observed for moderate Er3+ concentrations (6 mol %). Guided and side IR luminescence spectra have been obtained and contrasted. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367133
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  • 5
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    New setup for end-fire coupling excitation of planar waveguides at low temperatures (1997)
    American Institute of Physics
    Details
    Publication Date: 1997-06-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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  • 6
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    In-situ small-angle x-ray scattering study of nanoparticles in the plasma plume induced by pulsed laser irradiation of metallic targets (2012)
    American Institute of Physics
    Details
    Publication Date: 2012-04-16
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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  • 7
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    PIF4-induced BR synthesis is critical to diurnal and thermomorphogenic growth (2018)
    Springer Nature
    Details
    Publication Date: 2018
    Description: 〈sec〉〈st〉Synopsis〈/st〉〈p〉〈textbox textbox-type="graphic"〉〈p〉〈inline-fig〉〈/inline-fig〉〈/p〉〈/textbox〉〈/p〉 〈p〉Plant elongation in response to warmth and light is tightly controlled by steroid hormone-sensitive gene expression, but the dynamic regulation of this circuitry remains unresolved. Here, crosstalk between the 〈i〉Arabidopsis〈/i〉 transcription factors PIF4 and BES1 is shown to activate brassinosteroid (BR) synthesis and adjust seed stem growth to the daily changes of environmental stimuli.〈/p〉 〈p〉 〈l type="unord"〉〈li〉〈p〉Interaction with PIF4 switches BES1 activity from a repressive to an activator function.〈/p〉〈/li〉 〈li〉〈p〉BES1 binds as a homodimer to conserved BRRE and G-box elements in the promoters of BR biosynthetic and BES-DOWN genes.〈/p〉〈/li〉 〈li〉〈p〉The PIF4-BES1 complex recognizes a CATGTG motif or PBE-element that is enriched in the promoters of PIF-UP and PIF + BES-UP targets.〈/p〉〈/li〉 〈li〉〈p〉Accumulation of PIF4 at warm temperatures up-regulates BR levels by competing for BES1 homodimerization.〈/p〉〈/li〉〈/l〉 〈/p〉〈/sec〉
    Print ISSN: 0261-4189
    Electronic ISSN: 1460-2075
    Topics: Biology , Medicine
    Published by Springer Nature on behalf of The European Molecular Biology Organization (EMBO).
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  • 8
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    PIF4-induced BR synthesis is critical to diurnal and thermomorphogenic growth (2018)
    Springer Nature
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    Publication Date: 2018
    Description: 〈p〉The 〈i〉Arabidopsis 〈/i〉PIF4 and BES1/BZR1 transcription factors antagonize light signaling by facilitating co-activated expression of a large number of cell wall-loosening and auxin-related genes. While PIF4 directly activates expression of these targets, BES1 and BZR1 activity switch from a repressive to an activator function, depending on interaction with TOPLESS and other families of regulators including PIFs. However, the complexity of this regulation and its role in diurnal control of plant growth and brassinosteroid (BR) levels is little understood. We show by using a protein array that BES1, PIF4, and the BES1-PIF4 complex recognize different DNA elements, thus revealing a distinctive cis-regulatory code beneath BES1-repressive and PIF4 co-activation function. BES1 homodimers bind to conserved BRRE- and G-box elements in the BR biosynthetic promoters and inhibit their expression during the day, while elevated PIF4 competes for BES1 homodimer formation, resulting in de-repressed BR biosynthesis at dawn and in response to warmth. Our findings demonstrate a central role of PIF4 in BR synthesis activation, increased BR levels being essential to thermomorphogenic hypocotyl growth.〈/p〉
    Print ISSN: 0261-4189
    Electronic ISSN: 1460-2075
    Topics: Biology , Medicine
    Published by Springer Nature on behalf of The European Molecular Biology Organization (EMBO).
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  • 9
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    Regulation of Root Angle and Gravitropism (2018)
    Genetics Society of America (GSA)
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    Publication Date: 2018-12-11
    Description: Regulation of plant root angle is critical for obtaining nutrients and water and is an important trait for plant breeding. A plant’s final, long-term root angle is the net result of a complex series of decisions made by a root tip in response to changes in nutrient availability, impediments, the gravity vector and other stimuli. When a root tip is displaced from the gravity vector, the short-term process of gravitropism results in rapid reorientation of the root toward the vertical. Here, we explore both short- and long-term regulation of root growth angle, using natural variation in tomato to identify shared and separate genetic features of the two responses. Mapping of expression quantitative trait loci mapping and leveraging natural variation between and within species including Arabidopsis suggest a role for PURPLE ACID PHOSPHATASE 27 and CELL DIVISION CYCLE 73 in determining root angle.
    Electronic ISSN: 2160-1836
    Topics: Biology
    Published by Genetics Society of America (GSA)
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  • 10
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    Evolution of the composition of nanoparticles formed by the nanosecond Nd:YAG laser irradiation of an aluminium target in N2–O2 gas mixtures (2017)
    Springer
    Details
    Publication Date: 2017-10-17
    Print ISSN: 0947-8396
    Electronic ISSN: 1432-0630
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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