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Comment
. 2002 Aug;14(8):1663-8.
doi: 10.1105/tpc.140810.

A role for a light-harvesting antenna complex of photosystem II in photoprotection

Govindjee  1
Affiliations
Comment

A role for a light-harvesting antenna complex of photosystem II in photoprotection

Govindjee. Plant Cell. 2002 Aug.
No abstract available

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Figures

<b>Figure 1.</b>
Figure 1.
Model of Thermal Dissipation in Vascular Plants and Green Alga. High light results in lumen acidification, which in turn stimulates changes in the antenna of PSII that promote thermal dissipation. The exact nature of these changes has not been defined, but they may include conformational changes in LHCII trimers, protonation of and conformational changes in the LHCII monomers and/or minor antenna (CP26, CP29, etc.), and/or protonation of and conformational changes in PsbS. These complexes all have been implicated as sites of thermal dissipation. The acidification also stimulates the deepoxidation of V to Z. Z acts either “directly” (by accepting excitation energy from Chl* and dissipating it as heat) or “indirectly” (by altering antenna conformation) to further increase the rate of thermal dissipation. (Figure courtesy of Dafna Elrad.)
<b>Figure 2.</b>
Figure 2.
False-Color Image of NPQ Generated by Video Imaging of Chlorophyll Fluorescence. (A) Wild-type Chlamydomonas cells and a mutant strain defective in thermal dissipation. (B) Wild-type Arabidopsis seedlings and seedlings of a mutant defective in thermal dissipation. (C) Wild-type Chlamydomonas, the npq5 mutant strain, and the npq5 mutant strain complemented with the Lhcbm1 gene. In (A) and (B), the mutant cells and seedlings appear dark blue, indicating a decrease in NPQ relative to the wild type, which appear green with some yellow-orange specks (as indicated on the false-color scale). (Figure courtesy of Dafna Elrad.)
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