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@ARTICLE{Zimmermann:58849,
      author       = {Zimmermann, D. and Westhoff, M. and Zimmermann, G. and
                      Geßner, P. and Gessner, A. and Wegner, L. H. and Rokitta,
                      M. and Ache, P. and Schneider, H. and Vásquez, J. A. and
                      Kruck, W. and Shirley, St. and Jakob, P. and Hedrich, R. and
                      Bentrup, F.-W. and Bamberg, E. and Zimmermann, U.},
      title        = {{F}oliar water supply of tall trees: evidence for
                      mucilage-facilitated moisture uptake from the atmosphere and
                      the impact on pressure bomb measurements},
      journal      = {Protoplasma},
      volume       = {232},
      issn         = {0033-183X},
      address      = {Wien},
      publisher    = {Springer},
      reportid     = {PreJuSER-58849},
      pages        = {11 - 34},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The water supply to leaves of 25 to 60 m tall trees
                      (including high-salinity-tolerant ones) was studied. The
                      filling status of the xylem vessels was determined by xylem
                      sap extraction (using jet-discharge, gravity-discharge, and
                      centrifugation) and by (1)H nuclear magnetic resonance
                      imaging of wood pieces. Simultaneously, pressure bomb
                      experiments were performed along the entire trunk of the
                      trees up to a height of 57 m. Clear-cut evidence was found
                      that the balancing pressure (P(b)) values of leafy twigs
                      were dictated by the ambient relative humidity rather than
                      by height. Refilling of xylem vessels of apical leaves
                      (branches) obviously mainly occurred via moisture uptake
                      from the atmosphere. These findings could be traced back to
                      the hydration and rehydration of mucilage layers on the leaf
                      surfaces and/or of epistomatal mucilage plugs. Xylem vessels
                      also contained mucilage. Mucilage formation was apparently
                      enforced by water stress. The observed mucilage-based foliar
                      water uptake and humidity dependency of the P(b) values are
                      at variance with the cohesion-tension theory and with the
                      hypothesis that P(b) measurements yield information about
                      the relationships between xylem pressure gradients and
                      height.},
      keywords     = {Adhesives: metabolism / Atmosphere: chemistry / Dehydration
                      / Glycosaminoglycans: metabolism / Gravitation / Magnetic
                      Resonance Spectroscopy / Plant Leaves: cytology / Plant
                      Leaves: physiology / Pressure / Trees: cytology / Trees:
                      physiology / Water: metabolism / Xylem: physiology /
                      Adhesives (NLM Chemicals) / Glycosaminoglycans (NLM
                      Chemicals) / Water (NLM Chemicals) / J (WoSType)},
      cin          = {ICG-3},
      ddc          = {570},
      cid          = {I:(DE-Juel1)ICG-3-20090406},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Plant Sciences / Cell Biology},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:18176835},
      UT           = {WOS:000252224200002},
      doi          = {10.1007/s00709-007-0279-2},
      url          = {https://juser.fz-juelich.de/record/58849},
}