REGULATION OF LIGHT HARVESTING IN GREEN PLANTS

Annual Reviews - Tập 47 Số 1 - Trang 655-684 - 1996
Peter Horton1, Alexander V. Ruban1, Robin Walters1
1Department of Molecular Biology and Biotechnology, Robert Hill Institute, University of Sheffield, Sheffield S10 2TN, United Kingdom

Tóm tắt

▪ Abstract  When plants are exposed to light intensities in excess of those that can be utilized in photosynthetic electron transport, nonphotochemical dissipation of excitation energy is induced as a mechanism for photoprotection of photosystem II. The features of this process are reviewed, particularly with respect to the molecular mechanisms involved. It is shown how the dynamic properties of the proteins and pigments of the chlorophyll a/b light-harvesting complexes of photosystem II first enable the level of excitation energy to be sensed via the thylakoid proton gradient and subsequently allow excess energy to be dissipated as heat by formation of a nonphotochemical quencher. The nature of this quencher is discussed, together with a consideration of how the variation in capacity for energy dissipation depends on specific features of the composition of the light-harvesting system. Finally, the prospects for future progress in understanding the regulation of light harvesting are assessed.

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Annual Reviews

Tập 47 Số 1

655-684

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