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@ARTICLE{Franco:51979,
      author       = {Franco, A. C. and Matsubara, S. and Orthen, B.},
      title        = {{P}hotoinhibition, carotenoid composition and the
                      co-regulation of photochemical and non-photochemical
                      quenching in neotropical savanna trees},
      journal      = {Tree physiology},
      volume       = {27},
      issn         = {0829-318X},
      address      = {Victoria, BC},
      publisher    = {Heron},
      reportid     = {PreJuSER-51979},
      pages        = {717 - 725},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Plants in the neotropical savannas of central Brazil are
                      exposed to high irradiances, high air temperatures and low
                      relative humidities. These conditions impose a selection
                      pressure on plants for strong stomatal regulation of
                      transpiration to maintain water balance. Diurnal adjustments
                      of non-photochemical energy dissipation in photosystem 11
                      (PSII) provide a dynamic mechanism to reduce the risk of
                      photoinhibitory damage during the middle of the day when
                      irradiances and leaf temperatures are high and partial
                      closure of the stomata results in considerable reductions in
                      internal CO2 concentration. At the end of the dry season, we
                      measured diurnal changes in gas exchange, chlorophyll
                      fluorescence parameters and carotenoid composition in two
                      savanna tree species differing in photosynthetic capacity
                      and in the duration and extent of the midday depression of
                      photosynthesis. Non-photochemical quenching and its quantum
                      yield were tightly correlated with zeaxanthin concentrations
                      on a total chlorophyll basis, indicating that the reversible
                      de-epoxidation of violaxanthin to antheraxanthin and
                      zeaxanthin within the xanthophyll cycle plays a key role in
                      the regulation of thermal energy dissipation. In both cases,
                      a single linear relationship fitted both species. Although
                      efficient regulation of photochemical and non-photochemical
                      quenching and adjustments in the partitioning of electron
                      flow between assimilative and non-assimilative processes
                      were operating, these trees could not fully cope with the
                      rapid increase in irradiance after sunrise, suggesting high
                      vulnerability to photoinhibitory damage in the morning.
                      However, both species were able to recover quickly. The
                      effects of photoinhibitory quenching were largely reversed
                      by midday, and zeaxanthin rapidly converted back to
                      violaxanthin as irradiance decreased in late afternoon,
                      resulting in the maximal quantum yield of PSII of around 0.8
                      just before sunrise.},
      keywords     = {J (WoSType)},
      cin          = {ICG-3},
      ddc          = {630},
      cid          = {I:(DE-Juel1)ICG-3-20090406},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Forestry},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000246531300008},
      url          = {https://juser.fz-juelich.de/record/51979},
}