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
Photosynthetic variation and carbon isotope discrimination in invasive wetland grasses in response to flooding
TL;DR: Activities of the anaerobic respiration enzyme alcohol dehydrogenase in roots suggested invasive Phragmites was the most tolerant of flooding, while native Spartina was the next most flood tolerant and Sorghum was flood sensitive.
Journal ArticleDOI
Effect of photoperiod and light intensity on in vitro propagation of Alocasia amazonica
TL;DR: It is concluded that both light intensity and photoperiod independently affect growth of A. amazonica and development of stomata, depending on the intensity and duration of light treatment.
Journal ArticleDOI
Generation of fluorescence quenchers from the triplet states of chlorophylls in the major light-harvesting complex II from green plants
Virginijus Barzda,Mikas Vengris,Leonas Valkunas,and Rienk van Grondelle,Herbert van Amerongen +4 more
TL;DR: Laser flash-induced changes of the fluorescence yield were studied in aggregates of light-harvesting complex II (LHCII) on a time scale ranging from microseconds to seconds, and it is proposed that long-lived fluorescence quenchers can be generated from Chl triplets that are not transferred to Car molecules.
Journal ArticleDOI
Different patterns of carotenoid composition and photosynthesis acclimation in two tropical red algae
TL;DR: Red algae as a group do not have a universal carotenoid composition and NPQ was not correlated with any xanthophyll cycle during short-term acclimation to light, which might provide this species with a competitive advantage under conditions of changing irradiance in the field.
Journal ArticleDOI
Protective effect of active oxygen scavengers on protein degradation and photochemical function in photosystem I submembrane fractions during light stress.
TL;DR: The specific action of histidine and n‐propyl gallate indicates that 1O2 was the main form of reactive oxygen species responsible for strong light‐induced damage in PSI submembrane fractions.
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).
Journal ArticleDOI
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.