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@ARTICLE{Kaufmann:964,
      author       = {Kaufmann, I. and Schulze-Till, T. and Schneider, H. U. and
                      Zimmermann, U. and Jakob, P. and Wegner, L. H.},
      title        = {{F}unctional repair of embolized vessels in maize roots
                      after temporal drought stress, as demonstrated by magnetic
                      resonance imaging},
      journal      = {The new phytologist},
      volume       = {184},
      issn         = {0028-646X},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {PreJuSER-964},
      pages        = {245 - 256},
      year         = {2009},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Xylem sap under high tension is in a metastable state and
                      tends to cavitate, frequently leading to an interruption of
                      the continuous water columns. Mechanisms of cavitation
                      repair are controversially discussed. Magnetic resonance
                      (MR) imaging provides a noninvasive, high spatial and
                      temporal resolution approach to monitor xylem cavitation,
                      refilling, and functionality. Spin density maps of
                      drought-stressed maize taproots were recorded to localize
                      cavitation events and to visualize the refilling processes;
                      c. 2 h after release of the nutrient solution from the
                      homemade MR imaging cuvette that received the root, late
                      metaxylem vessels started to cavitate randomly as identified
                      by a loss of signal intensity. After c. 6 h plants were
                      rewatered, leading to a repair of water columns in five out
                      of eight roots. Sap ascent during refilling, monitored with
                      multislice MR imaging sequences, varied between 0.5 mm
                      min(-1) and 3.3 mm min(-1). Flow imaging of apparently
                      refilled vessels was performed to test for functional
                      repair. Occasionally, a collapse of xylem vessels under
                      tension was observed; this collapse was reversible upon
                      rewatering. Refilling was an all-or-none process only
                      observed under low-light conditions. Absence of flow in some
                      of the apparently refilled vessels indicates that
                      functionality was not restored in these particular vessels,
                      despite a recovery of the spin density signal.},
      keywords     = {Droughts / Magnetic Resonance Spectroscopy / Models,
                      Biological / Plant Exudates: metabolism / Plant Roots:
                      cytology / Plant Roots: physiology / Plant Transpiration /
                      Seedling: physiology / Spin Labels / Stress, Physiological /
                      Time Factors / Xylem: physiology / Zea mays: physiology /
                      Plant Exudates (NLM Chemicals) / Spin Labels (NLM Chemicals)
                      / J (WoSType)},
      cin          = {ICG-3},
      ddc          = {580},
      cid          = {I:(DE-Juel1)ICG-3-20090406},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Plant Sciences},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:19563443},
      UT           = {WOS:000269541600023},
      doi          = {10.1111/j.1469-8137.2009.02919.x},
      url          = {https://juser.fz-juelich.de/record/964},
}