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
作者： Nicolae Moise , Ismaël Moya
DOI: 10.1016/J.BBABIO.2004.04.001
关键词: Yield (chemistry) 、 Chlorophyll fluorescence 、 Phase (matter) 、 Chemistry 、 Quenching (fluorescence) 、 Analytical chemistry 、 Fluorescence spectroscopy 、 Photosystem II 、 Fluorescence 、 Chlorophyll
摘要: The relationship between the fluorescence lifetime (tau) and yield (Phi) obtained in phase modulation fluorometry at 54 MHz during chlorophyll induction dark-adapted leaves under low actinic light has been investigated. Three typical phases have identified: (i) linear OI photochemical rise, (ii) convex curvature subsequent IP thermal (iii) PS slow decay. A similar for measured 685 nm plotted versus 735 nm. spectrally resolved analysis shows that of tau-Phi is not due to reabsorption effects. Several other hypotheses are discussed we conclude a variable transitory nonphotochemical quenching. We tentatively propose this quenching results from conformational change pigment-protein complex Photosystem II core antenna could explain both spectral temporal changes fluorescence. blue shift peak spectrum observed, supporting hypothesis.
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