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@ARTICLE{Rascher:9981,
      author       = {Rascher, U. and Biskup, B. and Leakey, A.D.B. and McGrath,
                      J.M. and Ainsworth, E.A.},
      title        = {{A}ltered physiological function, not structure, drives
                      increased radiation-use efficiency of soybean grown at
                      elevated {CO}2},
      journal      = {Photosynthesis research},
      volume       = {105},
      issn         = {0166-8595},
      address      = {Dordrecht [u.a.]},
      publisher    = {Springer Science + Business Media B.V},
      reportid     = {PreJuSER-9981},
      pages        = {15 - 25},
      year         = {2010},
      note         = {We thank Tim Mies for technical assistance, and Steve Long
                      for supporting our research at SoyFACE. SoyFACE was
                      supported by the Illinois Council for Food and Agricultural
                      Research, Archer Daniels Midland Company, the U.S.
                      Department of Agricultural, and the Illinois Agricultural
                      Experiment Station. B. Biskup and U. Rascher were supported
                      by a NSF/DAAD grant (grant PPP D/05/50496). B. Biskup also
                      acknowledges support of his PhD thesis by the Heinrich-Heine
                      University of Dusseldorf, Germany. We thank K.G. Rascher for
                      assistance with the statistical analyses, and D. Ort for
                      valuable discussions. We also greatly thank H. Scharr for
                      supporting the development of the stereo system and the
                      development of the analyses algorithms.},
      abstract     = {Previous studies of elevated carbon dioxide concentration
                      ([CO(2)]) on crop canopies have found that radiation-use
                      efficiency is increased more than radiation-interception
                      efficiency. It is assumed that increased radiation-use
                      efficiency is due to changes in leaf-level physiology;
                      however, canopy structure can affect radiation-use
                      efficiency if leaves are displayed in a manner that
                      optimizes their physiological capacity, even though the
                      canopy intercepts the same amount of light. In order to
                      determine the contributions of physiology and canopy
                      structure to radiation-use and radiation-interception
                      efficiency, this study relates leaf-level physiology and
                      leaf display to photosynthetic rate of the outer canopy. We
                      used a new imaging approach that delivers three-dimensional
                      maps of the outer canopy during the growing season. The 3D
                      data were used to model leaf orientation and mean
                      photosynthetic electron transport of the outer canopy to
                      show that leaf orientation changes did not contribute to
                      increased radiation-use; i.e. leaves of the outer canopy
                      showed similar diurnal leaf movements and leaf orientation
                      in both treatments. Elevated [CO(2)] resulted in an
                      increased maximum electron transport rate (ETR(max)) of
                      light reactions of photosynthesis. Modeling of canopy light
                      interception showed that stimulated leaf-level electron
                      transport at elevated [CO(2)], and not alterations in leaf
                      orientation, was associated with stimulated radiation-use
                      efficiency and biomass production in elevated [CO(2)]. This
                      study provides proof of concept of methodology to quantify
                      structure-function relationships in combination, allowing a
                      quantitative estimate of the contribution of both effects to
                      canopy energy conversion under elevated [CO(2)].},
      keywords     = {Carbon Dioxide: pharmacology / Electron Transport: drug
                      effects / Photosynthesis: drug effects / Soybeans: drug
                      effects / Soybeans: growth $\&$ development / Soybeans:
                      physiology / Carbon Dioxide (NLM Chemicals) / J (WoSType)},
      cin          = {ICG-3},
      ddc          = {580},
      cid          = {I:(DE-Juel1)ICG-3-20090406},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Plant Sciences},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:20407832},
      UT           = {WOS:000278902700003},
      doi          = {10.1007/s11120-010-9548-6},
      url          = {https://juser.fz-juelich.de/record/9981},
}