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@ARTICLE{Metzner:10545,
      author       = {Metzner, R. and Thorpe, M.R. and Breuer, U. and Blümler,
                      P. and Schurr, U. and Schneider, H. U. and Schröder, W. H.},
      title        = {{C}ontrasting dynamics of water and mineral nutrients in
                      stems shown by stable isotope tracers and cryo-{SIMS}},
      journal      = {Plant, cell $\&$ environment},
      volume       = {33},
      issn         = {0140-7791},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {PreJuSER-10545},
      pages        = {1393 - 1407},
      year         = {2010},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Lateral exchange of water and nutrients between xylem and
                      surrounding tissues helps to de-couple uptake from
                      utilization in all parts of a plant. We studied the dynamics
                      of these exchanges, using stable isotope tracers for water
                      (H(2)(18)O), magnesium ((26)Mg), potassium ((41)K) and
                      calcium ((44)Ca) delivered via a cut stem for various
                      periods to the transpiration stream of bean shoots
                      (Phaseolus vulgaris cv. Fardenlosa Shiny). Tracers were
                      subsequently mapped in stem cross-sections with
                      cryo-secondary ion mass spectrometry. The water tracer
                      equilibrated within minutes across the entire cross-section.
                      In contrast, the nutrient tracers showed a very
                      heterogeneous exchange between xylem vessels and the
                      different stem tissues, even after 4 h. Dynamics of
                      nutrients in the tissues revealed a fast and extensive
                      exchange of nutrients in the xylem parenchyma, with, for
                      example, calcium being completely replaced by tracer in less
                      than 5 min. Dilution of potassium tracer during its 30 s
                      transit in xylem sap through the stem showed that potassium
                      concentration was up-regulated over many hours, to the
                      extent that some of it was probably supplied by phloem
                      recirculation from the shoot.},
      keywords     = {Isotopes: analysis / Phaseolus: metabolism / Phaseolus:
                      physiology / Plant Stems: metabolism / Plant Stems:
                      physiology / Plant Transpiration / Water: metabolism /
                      Xylem: metabolism / Xylem: physiology / Isotopes (NLM
                      Chemicals) / Water (NLM Chemicals) / J (WoSType)},
      cin          = {ZCH / ICG-3 / JARA-ENERGY},
      ddc          = {570},
      cid          = {I:(DE-Juel1)ZCH-20090406 / I:(DE-Juel1)ICG-3-20090406 /
                      $I:(DE-82)080011_20140620$},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Plant Sciences},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:20444220},
      UT           = {WOS:000279610200014},
      doi          = {10.1111/j.1365-3040.2010.02157.x},
      url          = {https://juser.fz-juelich.de/record/10545},
}