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@PHDTHESIS{Nagel:46953,
      author       = {Nagel, Kerstin A.},
      title        = {{A}bhängigkeit des {W}urzelwachstums vom {L}ichtregime des
                      {S}prosses und deren {M}odifikation durch {N}ährstoffe
                      sowie im {G}ravitropismus},
      volume       = {63},
      school       = {Universität Düsseldorf},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-46953},
      isbn         = {3-89336-443-9},
      series       = {Schriften des Forschungszentrums Jülich. Reihe Umwelt /
                      Environment},
      pages        = {119 S.},
      year         = {2006},
      note         = {Record converted from VDB: 12.11.2012; Universität
                      Düsseldorf, Diss., 2006},
      abstract     = {The aim of this Ph.D. thesis was to characterise the
                      effects of light, also in combination with nutrient
                      availability or gravitropic response, on the growth dynamics
                      of Nicotiana tabacum. Seedling biomass, primary root growth
                      as well as sugar concentration in root and shoot increased
                      significantly with increasing light intensity (60 to 300
                      μmol m$^{-2}$ s$^{-1}$). To quantitatively analyse the
                      dynamics of root growth a digital image sequence processing
                      method with a high temporal and spatial resolution was
                      applied. Upon transition from low to high light intensities,
                      root growth increased continuously within four days,
                      reaching the steady-state level measured in plants that had
                      been cultivated in high-light conditions (300 μmol m$^{-2}$
                      s$^{-1}$). The entire root growth zone, and hence each phase
                      of cellular development, was affected very similarly by the
                      increasing light treatment. During the first three hours
                      after light increase, strong growth fluctuations were
                      observed repeatedly. While the first phase of the reaction
                      (0.5 h) could be attributed to hydraulic acclimation, the
                      second phase (2.5 h) could be ascribed to photosynthetic
                      acclimation. Experiments with externally applied sucrose and
                      with transgenic plants having reduced capacities for sucrose
                      synthesis indicated clearly that increasing light intensity
                      rapidly enhanced root growth by enhancing sucrose export
                      from shoot to root. High light intensity facilitated
                      increasing lateral root production under nutrient deficiency
                      some days earlier than low light conditions. This
                      demonstrates the tight and coordinated interaction between
                      carbohydrate and nutrient metabolism. By using two
                      Arabidopsis mutants, in which auxin-mediated signaling is
                      impaired, two spatially separated zones and motors of
                      curvature production in root tips were revealed after
                      rotating the plants by 90°. Only the second motor, which is
                      located more basal, seems to be auxin dependent. The
                      increase of curvature production of this motor after light
                      changing may be attributable to an increase of the
                      energy-dependent auxin-transport or to an enhancement of
                      circumnutation frequency. Due to the circumnutations,
                      leading to a transient curvature in the opposite direction
                      of gravitropic force, roots exhibited under low and high
                      light intensity 2.5 h after rotation by 90° comparable
                      curvature angles.},
      cin          = {ICG-III},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)VDB49},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/46953},
}