Journal ArticleDOI
Photoprotection and Other Responses of Plants to High Light Stress
Barbara Demmig-Adams,William W. Adams +1 more
- Vol. 43, Iss: 1, pp 599-626
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TLDR
The Xanthophyll cycle and thermal energy dissipation were investigated in this paper. But the results of these experiments were limited to the case of light-capturing systems, where active oxygen was not formed in the Photochemical Apparatus.Abstract:
PHOTO PROTECTION 604 Prevention oj Excessive Light Absorption... 604 Removal of Excess Excitation Energy Directly within the Light-Capturing System ......... ...... . . ..... ..... . .... . ..... ...... .... . .. . .. . . ..... . . . ... ... . 604 Removal oj Active Oxygen Formed in the Photochemical Apparatus ........ . . .. . . . . . . 605 INACTIV A TIONiTURNOVER OF PS II 606 THE XANTHOPHYLL CYCLE AND THERMAL ENERGY DISSIPATION: A PHOTOPROTECTIVE RESPONSE 608 Characteristics oj the Xanthophyll Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . 608 Association Among the De-epoxidized State oj the Xanthophyll Cycle, Thermal Energy Dissipation. and Photoprotection .. .. . . . .. . . ...... .. .. ... ... 609 Operation of the Xanthophyll Cycle in the Field . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .... . . . .. . . . . 611 CONCLUSIONS 618read more
Citations
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Journal ArticleDOI
The xanthophyll cycle, its regulation and components
TL;DR: The xanthophyll cycle pigments are almost evenly distributed in the thylakoid membrane and at least part of the pigments appears to be free in the lipid matrix where it is concluded that the conversion by violaxanthin de-epoxidase occurs.
Journal ArticleDOI
Increased sensitivity to salt stress in an ascorbate-deficient Arabidopsis mutant
TL;DR: Low intrinsic asCorbate and an impaired ascorbate-glutathione cycle in the vtc-1 mutant under salt stress probably induced a dramatic decrease in the reduced form of ascorBate, which resulted in both enhanced ROS contents and decreased NPQ in thevtc-2 mutant.
Journal ArticleDOI
A critical analysis of the causes of boron toxicity in plants
TL;DR: Analysis of the sensitivity to B of a range of metabolic processes including photosynthesis, respiration and protein synthesis leads to the conclusion that growth is not restricted by effects of B on energy supply and not directly by inhibition of protein synthesis.
Journal ArticleDOI
When There Is Too Much Light
TL;DR: A great deal of importance has happened in research investigating photosynthetic response to environmental stress in the 25 years since the last anniversary issue of Plant Physiology, but from my perspective, the importance of one set of discoveries stands out from the others for its importance.
Journal ArticleDOI
Chlamydomonas Xanthophyll Cycle Mutants Identified by Video Imaging of Chlorophyll Fluorescence Quenching.
TL;DR: Observation of substantial, rapid, [delta]pH-dependent nonphotochemical quenching in the npq1 mutant demonstrates that the formation of zeaxanthin and antheraxanth in via violaxanthIn de-epoxidase activity is not required for all [ delta]PH- dependent nonphotochemically quenched in this alga, and the xanthophyll cycle is not necessary for survival of Chlamydomonas
References
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Journal ArticleDOI
The relationship between the quantum yield of photosynthetic electron transport and quenching of chlorophyll fluorescence
TL;DR: In this article, the quantum yield of non-cyclic electron transport was found to be directly proportional to the product of the photochemical fluorescence quenching (qQ) and the efficiency of excitation capture by open Photosystem II (PS II) reaction centres (Fv/Fm).
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Photon yield of O2 evolution and chlorophyll fluorescence characteristics at 77 K among vascular plants of diverse origins.
Olle Björkman,Barbara Demmig +1 more
TL;DR: Determinations of the photon yield of O2 evolution and the Fv/FM, 692 ratio can serve as excellent quantitative measures of photoinhibition of overall photosynthetic energy-conversion system and of photochemistry of photosystem II, respectively.
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Plant Responses to Multiple Environmental FactorsPhysiological ecology provides tools for studying how interacting environmental resources control plant growth
TL;DR: Plant growth in diverse environments requires a similar balance of resources-energy, water, and mineral nutrients-to maintain optimal growth, but these resources differ by at least two orders of magnitude in the availability.
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Comparison of the effect of excessive light on chlorophyll fluorescence (77K) and photon yield of O2 evolution in leaves of higher plants.
Barbara Demmig,Olle Björkman +1 more
TL;DR: It is proposed that high-light treatments can have at least two different, concurrent effects on 77K fluorescence in leaves, one results from damage to the photosystem II (PSII) reaction-center complex and leads to a rise in FO, 692; the other results from an increased non-radiative energy dissipation in the pigment bed.
Photoinhibition and zeaxanthin formation in intact leaves. A possible role of the xanthophyll cycle in the dissipation of excess light energy. [Populus balsamifera; Hedera; helix; Monstrosa deliciosa]
TL;DR: Comparative studies of chlorophyll a fluorescence and of the pigment composition of leaves suggest a specific role of zeaxanthin, a carotenoid formed in the xanthophyll cycle, in protecting the photosynthetic apparatus against the adverse effects of excessive light.