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Photoinduced reversible changes of protochlorophyll fluorescence in the model systems






Biofizika 30(6): 933-938

Photoinduced reversible changes of protochlorophyll fluorescence in the model systems

Photoinduced changes of protochlorophyll fluorescence at 77.degree. K were studied in the systems containing monomeric and aggregated forms of the pigment. Both types of the pigment forms under light effect show a fall of fluorescence intensity which is reversible after the temperature increase. The photoreactions observed seem to be related to elementary photoreduction of protochlorophyll, they model the initial stages of photobiogenesis of chlorophyll (chlorophyllid). In 10-3 M solution of protochlorophyll in ethanol at 77.degree. K containing the aggregated form with the fluorescence maximum at 651 nm along with the photoinduced fall of fluorescence non-fluorescing photoproduct with the adsorption in the region of 685-695 nm was observed. This photoproduct was similar to an intermediate compound (X690) of chlorophyll photobiogenesis. A hypothesis is substantiated concerning an essential role of molecular pigment-pigment interaction in elementary phototransformations of protochlorophyll pigment.

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Accession: 006110850



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