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@ARTICLE{Walter:36047,
      author       = {Walter, A. and Rascher, U. and Osmond, B.},
      title        = {{T}ransitions in photosynthetic parameters of midvein and
                      interveinal regions of leaves and their importance during
                      leaf growth and development},
      journal      = {Plant biology},
      volume       = {6},
      issn         = {1435-8603},
      address      = {Oxford [u.a.] :Wiley- Blackwell},
      publisher    = {Wiley-Blackwell - STM},
      reportid     = {PreJuSER-36047},
      pages        = {184 - 191},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The areal development of photosynthetic efficiency and
                      growth patterns in expanding leaves of two different
                      dicotyledonous species - Coccoloba uvifera and Sanchezia
                      nobilis - was investigated by imaging both processes
                      repeatedly over 32 days. Measurements were performed using
                      combined imaging systems for chlorophyll fluorescence and
                      growth, with the same spatial resolution. Significant
                      differences in potential quantum yield of photosynthesis (F
                      (v)/F (m)), a parameter indicating the functional status of
                      photosystem II, were found between midvein and interveinal
                      tissue. Although base-tip gradients and spatial patchiness
                      were observed in the distribution of relative growth rate,
                      neither midvein nor interveinal tissue showed such patterns
                      in F (v)/F (m). In young leaves, F (v)/F (m) of the midvein
                      was higher than F (v)/F (m) of interveinal tissue. This
                      difference declined gradually with time, and upon cessation
                      of growth, F (v)/F (m) of interveinal regions exceeded those
                      of midvein tissue. Images of chlorophyll fluorescence
                      quenching showed that DeltaF/F (m)' in the different tissues
                      correlated with F (v)/F (m), indicating that, in these
                      uniformly illuminated leaves, transitions in photosynthetic
                      electron transport activity follow those of predawn quantum
                      efficiency. We explore the implications of these
                      observations during leaf development, discuss effects of
                      sucrose delivery from veins to interveinal areas on relative
                      rates of photosynthetic development in these tissues, and
                      propose that the initially higher photosynthetic activity in
                      the midvein compared to the intervein tissues may supply
                      carbohydrates and energy for leaf growth processes.},
      keywords     = {Acanthaceae: growth $\&$ development / Chlorophyll:
                      metabolism / Photosynthesis: physiology / Plant Leaves:
                      anatomy $\&$ histology / Plant Leaves: growth $\&$
                      development / Polygonaceae: growth $\&$ development /
                      Chlorophyll (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:15045670},
      UT           = {WOS:000220875000011},
      doi          = {10.1055/s-2004-817828},
      url          = {https://juser.fz-juelich.de/record/36047},
}