Correlation between lifetime heterogeneity and kinetics heterogeneity during chlorophyll fluorescence induction in leaves: 1. Mono-frequency phase and modulation analysis reveals a conformational change of a PSII pigment complex during the IP thermal phase

Biochimica Et Biophysica Acta
Nicolae Moise, Ismaël Moya

Abstract

The relationship between the fluorescence lifetime (tau) and yield (Phi) obtained in phase and modulation fluorometry at 54 MHz during the chlorophyll fluorescence induction in dark-adapted leaves under low actinic light has been investigated. Three typical phases have been identified: (i) linear during the OI photochemical rise, (ii) convex curvature during the subsequent IP thermal rise, and (iii) linear during the PS slow decay. A similar relationship has been obtained in the fluorescence induction for the fluorescence yield measured at 685 nm plotted versus the fluorescence yield measured at 735 nm. A spectrally resolved analysis shows that the curvature of the tau-Phi relationship is not due to chlorophyll fluorescence reabsorption effects. Several other hypotheses are discussed and we conclude that the curvature of the tau-Phi relationship is due to a variable and transitory nonphotochemical quenching. We tentatively propose that this quenching results from a conformational change of a pigment-protein complex of Photosystem II core antenna during the IP phase and could explain both spectral and temporal transitory changes of the fluorescence. A variable blue shift of the 685 nm peak of the fluorescence spectrum during the...Continue Reading

References

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Citations

Aug 1, 2007·Photosynthesis Research·George C PapageorgiouKostas Stamatakis
Aug 8, 2007·Photosynthesis Research·Le Buu ThachChrista Critchley
Jul 20, 2012·Photosynthesis Research·Alexandrina Stirbet, Govindjee
Mar 5, 2013·Photosynthesis Research·Gert SchanskerGyőző Garab
Apr 1, 2014·Plant Physiology and Biochemistry : PPB·Sanjay RanjanPramod A Shirke
May 3, 2011·Journal of Photochemistry and Photobiology. B, Biology·George C Papageorgiou, Govindjee
Jul 31, 2013·Biochimica Et Biophysica Acta·Thomas de MarchinFabrice Franck
Apr 4, 2008·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Roberto PedrósStéphane Jacquemoud
Mar 13, 2015·Photosynthesis Research·Emily J Sylak-GlassmanGraham R Fleming

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