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Spatiotemporal Variation of Metabolism in a Plant Circadian Rhythm: The Biological Clock as an Assembly of Coupled Individual Oscillators

Rascher, Uwe ; Hütt, Marc-Thorsten ; Siebke, Katharina ; Osmond, Barry ; Beck, Friedrich ; Lüttge, Ulrich

Proceedings of the National Academy of Sciences - PNAS, 2001-09, Vol.98 (20), p.11801-11805 [Periódico revisado por pares]

United States: National Academy of Sciences

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  • Título:
    Spatiotemporal Variation of Metabolism in a Plant Circadian Rhythm: The Biological Clock as an Assembly of Coupled Individual Oscillators
  • Autor: Rascher, Uwe ; Hütt, Marc-Thorsten ; Siebke, Katharina ; Osmond, Barry ; Beck, Friedrich ; Lüttge, Ulrich
  • Assuntos: Biological Clocks - physiology ; Biological Sciences ; Botany ; Carbon dioxide ; Carbon Dioxide - metabolism ; Cells ; Cellular biology ; Chlorophylls ; Chronobiology ; Circadian rhythm ; Circadian Rhythm - physiology ; crassulacean acid ; Crassulacean acid metabolism ; Flowers & plants ; Fluorescence ; Leaves ; Light ; Magnoliopsida - physiology ; Metabolism ; Oscillators ; Oscillometry ; Photosynthesis ; Plant Leaves - physiology ; Plant Leaves - radiation effects ; Plants
  • É parte de: Proceedings of the National Academy of Sciences - PNAS, 2001-09, Vol.98 (20), p.11801-11805
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
    ObjectType-Article-1
    ObjectType-Feature-2
    To whom reprint requests should be addressed. E-mail: rascher@bio.tu-darmstadt.de.
    Edited by Klaus Hahlbrock, Max Planck Institute for Plant Breeding Research, Cologne, Germany, and approved July 10, 2001
  • Descrição: The complex dynamic properties of biological timing in organisms remain a central enigma in biology despite the increasingly precise genetic characterization of oscillating units and their components. Although attempts to obtain the time constants from oscillations of gene activity and biochemical units have led to substantial progress, we are still far from a full molecular understanding of endogenous rhythmicity and the physiological manifestations of biological clocks. Applications of nonlinear dynamics have revolutionized thinking in physics and in biomedical and life sciences research, and spatiotemporal considerations are now advancing our understanding of development and rhythmicity. Here we show that the well known circadian rhythm of a metabolic cycle in a higher plant, namely the crassulacean acid metabolism mode of photosynthesis, is expressed as dynamic patterns of independently initiated variations in photosynthetic efficiency (φPSII) over a single leaf. Noninvasive highly sensitive chlorophyll fluorescence imaging reveals randomly initiated patches of varying φPSIIthat are propagated within minutes to hours in wave fronts, forming dynamically expanding and contracting clusters and clearly dephased regions of φPSII. Thus, this biological clock is a spatio-temporal product of many weakly coupled individual oscillators, defined by the metabolic constraints of crassulacean acid metabolism. The oscillators operate independently in space and time as a consequence of the dynamics of metabolic pools and limitations of CO2diffusion between tightly packed cells.
  • Editor: United States: National Academy of Sciences
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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