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@ARTICLE{Cazzaniga:22167,
      author       = {Cazzaniga, S. and Li, Z. and Niyogi, K.K. and Bassi, R. and
                      Dall'Osto, L.},
      title        = {{T}he {A}rabidopsis szl1 mutant reveals a critical role of
                      ß-carotene in {P}hotosystem {I} photoprotection},
      journal      = {Plant physiology},
      volume       = {159},
      number       = {4},
      issn         = {0032-0889},
      address      = {Rockville, Md.: Soc.},
      publisher    = {JSTOR},
      reportid     = {PreJuSER-22167},
      pages        = {1745-1758},
      year         = {2012},
      note         = {This work was supported by the Marie Curie Actions-Networks
                      for Initial Training Harvest (grant no. PITN-GA-2009-238017)
                      and by Ministero delle Politiche Agricole, Alimentari e
                      Forestali BioMassVal (grant no. 2/01/140). Z.L. and K.K.N.
                      were supported by a grant from the Chemical Sciences,
                      Geosciences and Biosciences Division, Office of Basic Energy
                      Sciences, Office of Science, U.S. Department of Energy
                      (Field Work Proposal no. 449B).},
      abstract     = {Carotenes and their oxygenated derivatives, the
                      xanthophylls, are structural determinants in both
                      photosystems (PS) I and II. They bind and stabilize
                      photosynthetic complexes, increase the light-harvesting
                      capacity of chlorophyll-binding proteins, and have a major
                      role in chloroplast photoprotection. Localization of
                      carotenoid species within each PS is highly conserved: Core
                      complexes bind carotenes, whereas peripheral
                      light-harvesting systems bind xanthophylls. The specific
                      functional role of each xanthophyll species has been
                      recently described by genetic dissection, however the in
                      vivo role of carotenes has not been similarly defined. Here,
                      we have analyzed the function of carotenes in photosynthesis
                      and photoprotection, distinct from that of xanthophylls, by
                      characterizing the suppressor of zeaxanthin-less (szl)
                      mutant of Arabidopsis (Arabidopsis thaliana) which, due to
                      the decreased activity of the lycopene-β-cyclase, shows a
                      lower carotene content than wild-type plants. When grown at
                      room temperature, mutant plants showed a lower content in
                      PSI light-harvesting complex I complex than the wild type,
                      and a reduced capacity for chlorophyll fluorescence
                      quenching, the rapidly reversible component of
                      nonphotochemical quenching. When exposed to high light at
                      chilling temperature, szl1 plants showed stronger
                      photoxidation than wild-type plants. Both PSI and PSII from
                      szl1 were similarly depleted in carotenes and yet PSI
                      activity was more sensitive to light stress than PSII as
                      shown by the stronger photoinhibition of PSI and increased
                      rate of singlet oxygen release from isolated PSI
                      light-harvesting complex I complexes of szl1 compared with
                      the wild type. We conclude that carotene depletion in the
                      core complexes impairs photoprotection of both PS under high
                      light at chilling temperature, with PSI being far more
                      affected than PSII.},
      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:20495379},
      UT           = {WOS:000307236700034},
      doi          = {10.1104/pp.112.201137},
      url          = {https://juser.fz-juelich.de/record/22167},
}