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@ARTICLE{DeSchepper:134678,
      author       = {De Schepper, V. and Bühler, Jonas and Thorpe, Michael and
                      Roeb, Gerhard and Huber, Gregor and van Dusschoten, Dagmar
                      and Jahnke, Siegfried and Steppe, K.},
      title        = {11{C}-{PET} imaging reveals transport dynamics and
                      sectorial plasticity of oak phloem after girdling},
      journal      = {Frontiers in Plant Physiology},
      volume       = {4},
      number       = {200},
      issn         = {1664-462X},
      address      = {Lausanne},
      publisher    = {Frontiers Media},
      reportid     = {FZJ-2013-02778},
      pages        = {1-9},
      year         = {2013},
      abstract     = {Carbon transport processes in plants can be followed
                      non-invasively by repeated application of the short-lived
                      positron-emitting radioisotope 11C, a technique which has
                      rarely been used with trees. Recently, positron emission
                      tomography (PET) allowing 3D visualization has been adapted
                      for use with plants. To investigate the effects of stem
                      girdling on the flow of assimilates, leaves on first order
                      branches of two-year-old oak (Quercus robur L.) trees were
                      labeled with 11C by supplying 11CO2-gas to a leaf cuvette.
                      Magnetic resonance imaging gave an indication of the plant
                      structure, while PET registered the tracer flow in a stem
                      region downstream from the labeled branches. After repeated
                      pulse labeling, phloem translocation was shown to be
                      sectorial in the stem: leaf orthostichy determined the
                      position of the phloem sieve tubes containing labeled 11C.
                      The observed pathway remained unchanged for days. Tracer
                      time-series derived from each pulse and analysed with a
                      mechanistic model showed for two adjacent heights in the
                      stem a similar velocity but different loss of recent
                      assimilates. With either complete or partial girdling of
                      bark within the monitored region, transport immediately
                      stopped and then resumed in a new location in the stem
                      cross-section, demonstrating the plasticity of sectoriality.
                      One day after partial girdling, the loss of tracer along the
                      interrupted transport pathway increased, while the velocity
                      was enhanced in a non-girdled sector for several days. These
                      findings suggest that lateral sugar transport was enhanced
                      after wounding by a change in the lateral sugar transport
                      path and the axial transport resumed with the development of
                      new conductive tissue.},
      cin          = {IBG-2},
      ddc          = {580},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {242 - Sustainable Bioproduction (POF2-242)},
      pid          = {G:(DE-HGF)POF2-242},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000330166900001},
      pubmed       = {pmid:23785380},
      doi          = {10.3389/fpls.2013.00200},
      url          = {https://juser.fz-juelich.de/record/134678},
}