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@ARTICLE{Siebrecht:32998,
      author       = {Siebrecht, S. and Herdel, K. and Schurr, U.},
      title        = {{N}utrient translocation in the xylem of popular - diurnal
                      variations and spatial distribution along the shoot axis},
      journal      = {Planta},
      volume       = {217},
      issn         = {0032-0935},
      address      = {Berlin},
      publisher    = {Springer},
      reportid     = {PreJuSER-32998},
      pages        = {783 - 793},
      year         = {2003},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {This investigation shows diurnal variations in the xylem
                      sap composition of poplar (Populus tremula x P. alba). All
                      major macronutrients reached a maximum concentration in the
                      first half of the light period and decreased to the middle
                      of the night. The relative abundance of the nutrients did
                      not change during the day. The sap flow, which responded
                      very fast to the environmental changes (2.2-fold increase
                      within 10-20 min of illumination), reached a maximum value
                      in the second half of the light period. Transpiration (and
                      photosynthesis) was constant throughout the light phase. The
                      calculated translocation rates displayed a maximum in the
                      first half of the light period and therefore did not fit the
                      time course of sap flow. During the night, translocation
                      rates were $63-69\%$ lower than the maximum. The regulation
                      of nutrient translocation is discussed taking the active
                      xylem loading into account. The axial distribution located
                      the nitrate assimilation in younger leaves and storage of
                      nitrate (and other macronutrients) in older leaves. Nitrate
                      and potassium concentrations in the xylem sap did not change
                      along the plant axis. However, the sap flow was greater in
                      younger shoot sections than in older sections. We assume
                      that the greater demand for nitrate in the younger shoot
                      section was satisfied via an increased volume flow rather an
                      increased nitrate concentration.},
      keywords     = {Biological Transport: physiology / Biological Transport:
                      radiation effects / Calcium: metabolism / Chlorides:
                      metabolism / Circadian Rhythm: physiology / Light /
                      Magnesium: metabolism / Nitrate Reductase / Nitrate
                      Reductases: metabolism / Nitrates: metabolism /
                      Photosynthesis: physiology / Photosynthesis: radiation
                      effects / Plant Shoots: physiology / Plant Shoots: radiation
                      effects / Plant Transpiration: physiology / Plant
                      Transpiration: radiation effects / Populus: physiology /
                      Populus: radiation effects / Potassium: metabolism /
                      Quaternary Ammonium Compounds: metabolism / Sodium:
                      metabolism / Sulfates: metabolism / Chlorides (NLM
                      Chemicals) / Nitrates (NLM Chemicals) / Quaternary Ammonium
                      Compounds (NLM Chemicals) / Sulfates (NLM Chemicals) /
                      Magnesium (NLM Chemicals) / Potassium (NLM Chemicals) /
                      Sodium (NLM Chemicals) / Calcium (NLM Chemicals) / Nitrate
                      Reductases (NLM Chemicals) / Nitrate Reductase (NLM
                      Chemicals) / J (WoSType)},
      cin          = {ICG-III},
      ddc          = {580},
      cid          = {I:(DE-Juel1)VDB49},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Plant Sciences},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:12721678},
      UT           = {WOS:000185674000012},
      doi          = {10.1007/s00425-003-1041-4},
      url          = {https://juser.fz-juelich.de/record/32998},
}