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Issue 2, 2012
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Identification of two emitting sites in the dissipative state of the major light harvesting antenna

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Abstract

In order to cope with the deleterious effects of excess light, photosynthetic organisms have developed remarkable strategies where the excess energy is dissipated as heat by the antenna system. In higher plants one main player in the process is the major light harvesting antenna of Photosystem II (PSII), LHCII. In this paper we applied Stark fluorescence spectroscopy to LHCII in different quenching states to investigate the possible contribution of charge-transfer states to the quenching. We find that in the quenched state the fluorescence displays a remarkable sensitivity to the applied electric field. The resulting field-induced emission spectra reveal the presence of two distinct energy dissipating sites both characterized by a strong but spectrally very different response to the applied electric field. We propose the two states to originate from chlorophyllchlorophyll and chlorophyllcarotenoid charge transfer interactions coupled to the chlorophyll exciton state in the terminal emitter locus and discuss these findings in the light of the different models proposed to be responsible for energy dissipation in photosynthesis.

Graphical abstract: Identification of two emitting sites in the dissipative state of the major light harvesting antenna

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Article information


Submitted
27 Sep 2011
Accepted
01 Nov 2011
First published
25 Nov 2011

Phys. Chem. Chem. Phys., 2012,14, 759-766
Article type
Paper

Identification of two emitting sites in the dissipative state of the major light harvesting antenna

Md. Wahadoszamen, R. Berera, A. M. Ara, E. Romero and R. van Grondelle, Phys. Chem. Chem. Phys., 2012, 14, 759
DOI: 10.1039/C1CP23059J

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