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@ARTICLE{Alter:21720,
      author       = {Alter, P. and Dreissen, A. and Luo, F.-L. and Matsubara,
                      S.},
      title        = {{A}cclimatory responses of {A}rabidopsis to fluctuating
                      light environment: comparison of different sunfleck regimes
                      and accessions},
      journal      = {Photosynthesis research},
      volume       = {113},
      issn         = {0166-8595},
      address      = {Dordrecht [u.a.]},
      publisher    = {Springer Science + Business Media B.V},
      reportid     = {PreJuSER-21720},
      pages        = {221 - 237},
      year         = {2012},
      note         = {We thank Thomas Hombach, Andreas Averesch, and Siegfried
                      Jahnke (Forschungszentrum Julich) for designing,
                      constructing, and maintaining the sunfleck application
                      system. Valuable comments on the manuscript as well as kind
                      gift of seeds of Arabidopsis accessions by Maarten Koornneef
                      (Max Planck Institute for Plant Breeding Research, Cologne)
                      and the PsbS antiserum by Roberto Bassi (University of
                      Verona, Verona) are much appreciated. P. A. and A. D. are
                      grateful to Marcus Baumann (Aachen University of Applied
                      Sciences, Aachen) for his support of the diploma theses. The
                      work of F.-L. L. was supported by a PhD scholarship from the
                      Deusche Akademische Austausch Dienst (DAAD).},
      abstract     = {Acclimation to fluctuating light environment with short
                      (lasting 20 s, at 650 or 1,250 μmol photons m(-2) s(-1),
                      every 6 or 12 min) or long (for 40 min at 650 μmol
                      photons m(-2) s(-1), once a day at midday) sunflecks was
                      studied in Arabidopsis thaliana. The sunfleck treatments
                      were applied in the background daytime light intensity of
                      50 μmol photons m(-2) s(-1). In order to distinguish the
                      effects of sunflecks from those of increased daily
                      irradiance, constant light treatments at 85 and 120 μmol
                      photons m(-2) s(-1), which gave the same photosynthetically
                      active radiation (PAR) per day as the different sunfleck
                      treatments, were also included in the experiments. The
                      increased daily total PAR in the two higher constant light
                      treatments enhanced photosystem II electron transport and
                      starch accumulation in mature leaves and promoted expansion
                      of young leaves in Columbia-0 plants during the 7-day
                      treatments. Compared to the plants remaining under 50 μmol
                      photons m(-2) s(-1), application of long sunflecks caused
                      upregulation of electron transport without affecting carbon
                      gain in the form of starch accumulation and leaf growth or
                      the capacity of non-photochemical quenching (NPQ). Mature
                      leaves showed marked enhancement of the NPQ capacity under
                      the conditions with short sunflecks, which preceded recovery
                      and upregulation of electron transport, demonstrating the
                      initial priority of photoprotection. The distinct
                      acclimatory responses to constant PAR, long sunflecks, and
                      different combinations of short sunflecks are consistent
                      with acclimatory adjustment of the processes in
                      photoprotection and carbon gain, depending on the duration,
                      frequency, and intensity of light fluctuations. While the
                      responses of leaf expansion to short sunflecks differed
                      among the seven Arabidopsis accessions examined, all plants
                      showed NPQ upregulation, suggesting limited ability of this
                      species to utilize short sunflecks. The increase in the NPQ
                      capacity was accompanied by reduced chlorophyll contents,
                      higher levels of the xanthophyll-cycle pigments, faster
                      light-induced de-epoxidation of violaxanthin to zeaxanthin
                      and antheraxanthin, increased amounts of PsbS protein, as
                      well as enhanced activity of superoxide dismutase. These
                      acclimatory mechanisms, involving reorganization of
                      pigment-protein complexes and upregulation of other
                      photoprotective reactions, are probably essential for
                      Arabidopsis plants to cope with photo-oxidative stress
                      induced by short sunflecks without suffering from severe
                      photoinhibition and lipid peroxidation.},
      keywords     = {J (WoSType)},
      cin          = {IBG-2},
      ddc          = {580},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Plant Sciences},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:22729524},
      pmc          = {pmc:PMC3430843},
      UT           = {WOS:000308188800016},
      doi          = {10.1007/s11120-012-9757-2},
      url          = {https://juser.fz-juelich.de/record/21720},
}