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@ARTICLE{Gould:47496,
      author       = {Gould, N. and Thorpe, M. R. and Koroleva, O. and Minchin,
                      P. E. H.},
      title        = {{P}hloem hydrostatic pressure relates to solute loading
                      rate: a direct test of {M}ünch hypothesis},
      journal      = {Functional plant biology},
      volume       = {32},
      issn         = {1445-4408},
      address      = {Collingwood, Victoria},
      publisher    = {CSIRO Publ.},
      reportid     = {PreJuSER-47496},
      pages        = {1019 - 1026},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {According to the Munch hypothesis, a flow of solution
                      through the sieve tubes is driven by a hydrostatic pressure
                      difference between the source ( or collection) phloem and
                      the sink ( or release) phloem. A high hydrostatic pressure
                      is maintained in the collection phloem by the active uptake
                      of sugar and other solutes, with a concomitant inflow of
                      water. A lower pressure is maintained in the release phloem
                      through solute unloading. In this work we directly test the
                      role of solute uptake in creating the hydrostatic pressure
                      associated with phloem flow. Solute loading into the phloem
                      of mature leaves of barley and sow thistle was reduced by
                      replacing the air supply with nitrogen gas. Hydrostatic
                      pressure in adjacent sieve elements was measured with a
                      sieve-element pressure probe, a cell pressure probe glued to
                      the exuding stylet of aphids that had been feeding from the
                      phloem. Sieve element sap was sampled by aphid stylectomy;
                      sap osmotic pressure was determined by picolitre osmometry
                      and its sugar concentration by enzyme-linked fluorescence
                      assays. Samples were taken with a time resolution of similar
                      to 2 - 3 min. In accordance with Munch's proposal a drop in
                      osmotic and hydrostatic pressure in the source phloem
                      following treatment of the source leaf with N-2 was
                      observed. A decrease in sugar concentration was the major
                      contributor to the change in osmotic pressure. By observing
                      these variables at a time resolution of minutes we have
                      direct observation of the predictions of Munch.},
      keywords     = {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},
      UT           = {WOS:000232856600005},
      doi          = {10.1071/FP05036},
      url          = {https://juser.fz-juelich.de/record/47496},
}