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@ARTICLE{Prichard:37047,
      author       = {Prichard, J. and Tomos, A. D. and Farrar, J. F. and
                      Minchin, P. E. H. and Gould, N. and Paul, M. J. and MacRae,
                      E. A. and Ferrieri, R. A. and Gray, D. W. and Thorpe, M. R.},
      title        = {{T}urgor, solute import and growth in maize roots treated
                      with galactose},
      journal      = {Functional plant biology},
      volume       = {31},
      issn         = {1445-4408},
      address      = {Collingwood, Victoria},
      publisher    = {CSIRO Publ.},
      reportid     = {PreJuSER-37047},
      pages        = {1095 - 1103},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {It has been observed that extension growth in maize roots
                      is almost stopped by exposure to 5 mM D-galactose in the
                      root medium, while the import of recent photoassimilate into
                      the entire root system is temporarily promoted by the same
                      treatment. The aim of this study was to reconcile these two
                      apparently incompatible observations. We examined events
                      near the root tip before and after galactose treatment since
                      the tip region is the site of elongation and of high carbon
                      deposition in the root. The treatment rapidly decreased root
                      extension along the whole growing zone. In contrast, turgor
                      pressure, measured directly with the pressure probe in the
                      cortical cells of the growing zone, rapidly increased by
                      0.15 MPa within the first hour following treatment, and the
                      increase was maintained over the following 24 h. Both
                      tensiometric measurements and a comparison of turgor
                      pressure with local growth rate demonstrated that a rapid
                      tightening of the cell wall caused the reduction in growth.
                      Single cell sampling showed cell osmotic pressure increased
                      by 0.3 MPa owing to accumulation of both organic and
                      inorganic solutes. The corresponding change in cell water
                      potential was a rise from -0.18 MPa to approximately zero.
                      More mature cells at 14 mm from the root tip (just outside
                      the growing region) showed a qualitatively similar
                      response.Galactose treatment rapidly increased the import of
                      recently fixed carbon (RFC) into the whole root as deduced
                      by C-11 labelling of photoassimilate. In contrast, there was
                      a significant decrease in import of recently fixed carbon
                      into the apical 5 mm concomitant with the increase in turgor
                      in this region. No decrease in import of recently fixed
                      carbon was observed 5-15 mm from the root tip despite the
                      increase in cortical cell turgor. These data are consistent
                      with direct symplastic connections between the growing cells
                      and the phloem supplying the solutes in the apical, but not
                      the basal, regions of the growing zone. Hence, the
                      inhibition of growth and the elevation of solute import
                      induced by galactose are spatially separated within the
                      root.},
      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:000225301200005},
      doi          = {10.1071/FP04082},
      url          = {https://juser.fz-juelich.de/record/37047},
}