Charge accumulation and recombination in Photosystem II studied by thermoluminescence. II. Oscillation of the C band induced by flash excitation

  • Demeter S
  • Vass I
  • Horváth G
 et al. 
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Abstract

The characteristics of the thermoluminescence band appearing at +50°C in the glow curve (C band) was investigated in maize chloroplasts. The C band, which had a half-time of 10 min, could be charged in the presence of DCMU, and its amplitude significantly increased if preilluminated chloroplasts were reexcited after DCMU addition. Inactivation of the water-splitting system by hydroxylamine- or Tris-treatment did not abolish the C band. In chloroplasts subjected to various numbers of flashes before DCMU addition, the amplitude of the C band exhibited oscillation patterns which were markedly dependent upon dark adaptation of chloroplasts. Flash excitation of chloroplasts preilluminated by continuous light for 30 s prior to 5 min dark adaptation resulted in a period-4 oscillation with maxima occurring at flash numbers 0, 4, 8, 12. After a 6-h dark-adaptation of chloroplasts the period-4 oscillation was superimposed with a period-2 oscillation. The oscillatory patterns were simulated by model calculations and the possible origin of the C band is discussed. © 1984.

Author-supplied keywords

  • (Maize chloroplast)
  • Charge recombination
  • Electron transport
  • Photosystem II
  • Thermoluminescence
  • Water-splitting

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Authors

  • S. Demeter

  • I. Vass

  • G. Horváth

  • A. Läufer

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