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Low-temperature (77 K) phosphorescence of triplet chlorophyll in isolated reaction centers of photosystem II.

Article

Title:Low-temperature (77 K) phosphorescence of triplet chlorophyll in isolated reaction centers of photosystem II.
Authors:Neverov KV; Krasnovsky AA Jr; Zabelin AA; Shuvalov VA; Shkuropatov AY
Publication:Photosynth Res. 2015 Aug;125(1-2):43-9. doi: 10.1007/s11120-015-0105-1. Epub 2015 Feb 25.
PubmedID25712165
Abstract
Phosphorescence characterized by the main emission band at 952 +/- 1 nm (1.30 eV), the lifetime of 1.5 +/- 0.1 ms and the quantum yield nearly equal to that for monomeric chlorophyll a in aqueous detergent dispersions, has been detected in isolated reaction centers (RCs) of spinach photosystem II at 77 K. The excitation spectrum shows maxima corresponding to absorption bands of chlorophyll a, pheophytin a, and beta-carotene. The phosphorescence intensity strongly depends upon the redox state of RCs. The data suggest that the phosphorescence signal originates from the chlorophyll triplet state populated via charge recombination in the radical pair [Formula: see text].