Correlation between the time course of millisecond delayed fluorescence and that of prompt fluorescence at low temperature in uncoupled spinach chloroplasts
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Transient time courses ("induction") of the intensity of millisecond delayed fluorescence, measured between 0.1 and 3.9 msec after 0.9 msec-light excitation period, were studied and compared with the induction of the prompt fluorescence in uncoupled spinach chloroplasts at temperatures between 20 and - 170℃. The intensity of delayed fluorescence decreased during illumination, whereas that of prompt fluorescence increased at temperatures lower than 0℃. This type of correlation between these two time courses also was observed in the presence of 3-(3',4'-dichlorophenyl)-1,1-dimethylurea, ferricyanide or dephenylcarbazide at various temperatures. The correlation could be explained in terms of the redox states of the primary electron donor and the acceptor molecules in photosystem II. The enhancement of the intensity of the delayed fluorescence observed on cooling the material to -50℃ was due to the inhibition of electron donation from the water-splitting system by cooling, because enhancement was eliminated by an addition of diphenylcarbazide. Below -50℃ the intensity of delayed fluorescence decreased on cooling and became too low to detect below -170℃ under any of the conditions tested. This result is discussed in relation to the energy levels of redox components in reaction center.
- 日本植物生理学会の論文
- 1980-08-00
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