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@ARTICLE{Busch:56247,
      author       = {Busch, F. and Hüner, N. P. A. and Ensminger, I.},
      title        = {{I}ncreased air temperature during simulated autumn
                      conditions does not increase photosynthetic carbon gain but
                      affects the dissipation of excess energy in seedlings of the
                      evergreen conifer {J}ack {P}ine},
      journal      = {Plant physiology},
      volume       = {143},
      issn         = {0032-0889},
      address      = {Rockville, Md.: Soc.},
      publisher    = {JSTOR},
      reportid     = {PreJuSER-56247},
      pages        = {1242 - 1251},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Temperature and daylength act as environmental signals that
                      determine the length of the growing season in boreal
                      evergreen conifers. Climate change might affect the seasonal
                      development of these trees, as they will experience
                      naturally decreasing daylength during autumn, while at the
                      same time warmer air temperature will maintain
                      photosynthesis and respiration. We characterized the
                      down-regulation of photosynthetic gas exchange and the
                      mechanisms involved in the dissipation of energy in Jack
                      pine (Pinus banksiana) in controlled environments during a
                      simulated summer-autumn transition under natural conditions
                      and conditions with altered air temperature and photoperiod.
                      Using a factorial design, we dissected the effects of
                      daylength and temperature. Control plants were grown at
                      either warm summer conditions with 16-h photoperiod and 22
                      degrees C or conditions representing a cool autumn with 8
                      h/7 degrees C. To assess the impact of photoperiod and
                      temperature on photosynthesis and energy dissipation, plants
                      were also grown under either cold summer (16-h photoperiod/7
                      degrees C) or warm autumn conditions (8-h photoperiod/22
                      degrees C). Photosynthetic gas exchange was affected by both
                      daylength and temperature. Assimilation and respiration
                      rates under warm autumn conditions were only about one-half
                      of the summer values but were similar to values obtained for
                      cold summer and natural autumn treatments. In contrast,
                      photosynthetic efficiency was largely determined by
                      temperature but not by daylength. Plants of different
                      treatments followed different strategies for dissipating
                      excess energy. Whereas in the warm summer treatment safe
                      dissipation of excess energy was facilitated via zeaxanthin,
                      in all other treatments dissipation of excess energy was
                      facilitated predominantly via increased aggregation of the
                      light-harvesting complex of photosystem II. These
                      differences were accompanied by a lower deepoxidation state
                      and larger amounts of beta-carotene in the warm autumn
                      treatment as well as by changes in the abundance of
                      thylakoid membrane proteins compared to the summer
                      condition. We conclude that photoperiod control of dormancy
                      in Jack pine appears to negate any potential for an
                      increased carbon gain associated with higher temperatures
                      during the autumn season.},
      keywords     = {Carbohydrate Metabolism / Carbon: metabolism / Carbon
                      Dioxide: metabolism / Chlorophyll: metabolism / Energy
                      Metabolism / Fluorescence / Photoperiod / Photosynthesis /
                      Pigments, Biological: metabolism / Pinus: growth $\&$
                      development / Pinus: metabolism / Saskatchewan / Seasons /
                      Seedling: metabolism / Temperature / Pigments, Biological
                      (NLM Chemicals) / Carbon Dioxide (NLM Chemicals) /
                      Chlorophyll (NLM Chemicals) / Carbon (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:17259287},
      pmc          = {pmc:PMC1820919},
      UT           = {WOS:000244757700016},
      doi          = {10.1104/pp.106.092312},
      url          = {https://juser.fz-juelich.de/record/56247},
}