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@ARTICLE{Chow:46406,
      author       = {Chow, W. S. and Lee, A.-Y. and He, J. and Hendrickson, L.
                      and Hong, Y.-N. and Matsubara, S.},
      title        = {{P}hotoinactivation of {P}hotosystem {II} in leaves},
      journal      = {Photosynthesis research},
      volume       = {84},
      issn         = {0166-8595},
      address      = {Dordrecht [u.a.]},
      publisher    = {Springer Science + Business Media B.V},
      reportid     = {PreJuSER-46406},
      pages        = {35 - 41},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Photoinactivation of Photosystem II (PS II), the
                      light-induced loss of ability to evolve oxygen, inevitably
                      occurs under any light environment in nature, counteracted
                      by repair. Under certain conditions, the extent of
                      photoinactivation of PS II depends on the photon exposure
                      (light dosage, x), rather than the irradiance or duration of
                      illumination per se, thus obeying the law of reciprocity of
                      irradiance and duration of illumination, namely, that equal
                      photon exposure produces an equal effect. If the probability
                      of photoinactivation (p) of PS II is directly proportional
                      to an increment in photon exposure (p = kDeltax, where k is
                      the probability per unit photon exposure), it can be deduced
                      that the number of active PS II complexes decreases
                      exponentially as a function of photon exposure: N =
                      Noexp(-kx). Further, since a photon exposure is usually
                      achieved by varying the illumination time (t) at constant
                      irradiance (I), N = Noexp(-kI t), i.e., N decreases
                      exponentially with time, with a rate coefficient of
                      photoinactivation kI, where the product kI is obviously
                      directly proportional to I. Given that N = Noexp(-kx), the
                      quantum yield of photoinactivation of PS II can be defined
                      as -dN/dx = kN, which varies with the number of active PS II
                      complexes remaining. Typically, the quantum yield of
                      photoinactivation of PS II is ca. 0.1micromol PS II per mol
                      photons at low photon exposure when repair is inhibited.
                      That is, when about 10(7) photons have been received by leaf
                      tissue, one PS II complex is inactivated. Some species such
                      as grapevine have a much lower quantum yield of
                      photoinactivation of PS II, even at a chilling temperature.
                      Examination of the longer-term time course of
                      photoinactivation of PS II in capsicum leaves reveals that
                      the decrease in N deviates from a single-exponential decay
                      when the majority of the PS II complexes are inactivated in
                      the absence of repair. This can be attributed to the
                      formation of strong quenchers in severely-photoinactivated
                      PS II complexes, able to dissipate excitation energy
                      efficiently and to protect the remaining active neighbours
                      against damage by light.},
      keywords     = {Chloroplasts: metabolism / Chloroplasts: radiation effects
                      / Light / Models, Biological / Photosystem II Protein
                      Complex: metabolism / Photosystem II Protein Complex:
                      radiation effects / Plant Leaves: metabolism / Plant Leaves:
                      radiation effects / Photosystem II Protein Complex (NLM
                      Chemicals) / J (WoSType)},
      cin          = {ICG-III},
      ddc          = {580},
      cid          = {I:(DE-Juel1)VDB49},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Plant Sciences},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:16049752},
      UT           = {WOS:000230845200007},
      doi          = {10.1007/s11120-005-0410-1},
      url          = {https://juser.fz-juelich.de/record/46406},
}