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@ARTICLE{Jahnke:61833,
      author       = {Jahnke, S. and Krewitt, M.},
      title        = {{A}tmospheric {CO}2 concentration may directly affect leaf
                      respiration measurement in tobacco, but not respiration
                      itself},
      journal      = {Plant, cell $\&$ environment},
      volume       = {25},
      issn         = {0140-7791},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {PreJuSER-61833},
      pages        = {641 - 651},
      year         = {2002},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {When atmospheric CO2 concentration increases, various
                      consequences for plant metabolism have been suggested, such
                      as changes in photosynthesis, photo respiration or
                      respiration which can affect growth and carbon
                      sequestration. In addition to long-term (indirect) effects
                      on respiration, short-term (direct) effects of CO2
                      concentration on the respiration of leaves, shoots and roots
                      are described in the literature. In most cases, respiration
                      is reported to be inhibited by increased CO2 concentration,
                      but the mechanism(s) are not yet understood. It has been
                      shown previously that, when the respective technical
                      problems and properties of a gas exchange system are fully
                      considered, a short-term increase in CO2 (up to 4200 mumol
                      mol(-1)) had no effect on respiration of Phaseolus or
                      Populus leaves (Jahnke, Plant, Cell and Environment 24,
                      1139-1151, 2001). However, in the present study, large
                      (apparent) CO2 effects were found with mature Nicotiana
                      leaves whereas, in young leaves, the effect was absent. The
                      experimental results clearly show that the observed direct
                      CO2 effect on dark CO2 efflux in the mature tobacco leaves
                      was caused by leakage of CO2 inside the leaves (and the
                      magnitude of the effect was dependent on the size of the
                      leakage). Nicotiana leaves are, in contrast to Phaseolus and
                      Populus leaves (which are heterobaric), characterized by a
                      homobaric anatomy in which intercellular air spaces are not
                      compartmented and provide a continuous system of open pores
                      in the lateral (paradermal) direction of the leaves.
                      Mesophyll porosity increases with leaf development, which
                      explains the differences between young and mature tobacco
                      leaves. When internal leakage was experimentally restricted,
                      the CO2 inhibition on CO2 efflux was no longer observed. It
                      is concluded that the measured direct CO2 effect(s) on leaf
                      CO2 efflux in the dark are artefactual, and that a true
                      direct CO2 effect on leaf respiration does not exist.},
      keywords     = {J (WoSType)},
      cin          = {ICG-III},
      ddc          = {570},
      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:000175386300006},
      doi          = {10.1046/j.1365-3040.2002.00854.x},
      url          = {https://juser.fz-juelich.de/record/61833},
}