scholarly journals Photodamage of the Photosynthetic Apparatus and Its Dependence on the Leaf Developmental Stage in the npq1 Arabidopsis Mutant Deficient in the Xanthophyll Cycle Enzyme Violaxanthin De-epoxidase

2000 ◽  
Vol 124 (1) ◽  
pp. 273-284 ◽  
Author(s):  
Michel Havaux ◽  
Jean-Paul Bonfils ◽  
Cornelius Lütz ◽  
Krishna K. Niyogi
Keyword(s):  
Developmental Stage ◽  
Xanthophyll Cycle ◽  
Photosynthetic Apparatus ◽  
Cycle Enzyme ◽  
Arabidopsis Mutant ◽  
Leaf Developmental Stage

Influence of ascorbate and pH on the activity of the diatom xanthophyll cycle-enzyme diadinoxanthin de-epoxidase

2006 ◽  
Vol 126 (2) ◽  
pp. 205-211 ◽  
Author(s):  
Irina Grouneva ◽  
Torsten Jakob ◽  
Christian Wilhelm ◽  
Reimund Goss
Keyword(s):  
Xanthophyll Cycle ◽  
Cycle Enzyme

Violaxanthin De-Epoxidase, the Xanthophyll Cycle Enzyme, Requires Lipid Inverted Hexagonal Structures for Its Activity†

Biochemistry ◽  
2004 ◽  
Vol 43 (15) ◽  
pp. 4417-4420 ◽  
Author(s):  
Dariusz Latowski ◽  
Hans-Erik Åkerlund ◽  
Kazimierz Strzałka
Keyword(s):  
Xanthophyll Cycle ◽  
Cycle Enzyme

Involvement of the Xanthophyll Cycle in Regulation of Cyclic Electron Flow around Photosystem II

1996 ◽  
Vol 51 (1-2) ◽  
pp. 47-52 ◽  
Author(s):  
W. I. Gruszecki ◽  
K. Strzałk ◽  
K.P. Bader ◽  
A. Radunz ◽  
G.H. Schmid
Keyword(s):  
Electron Transport ◽  
Photosystem Ii ◽  
Oxygen Evolution ◽  
Xanthophyll Cycle ◽  
Electron Flow ◽  
Photosynthetic Apparatus ◽  
Photosynthetic Oxygen Evolution ◽  
Cyclic Electron Transport ◽  
Ps Ii ◽  
Low Levels

Abstract In our previous study (Gruszecki et al., 1995) we have postulated that the mechanism of cyclic electron transport around photosystem II, active under overexcitation of the photosynthetic apparatus by light is under control of the xanthophyll cycle. The combination of dif­ferent light quality and thylakoids having various levels of xanthophyll cycle pigments were applied to support this hypothesis. In the present work photosynthetic oxygen evolution from isolated tobacco chloroplasts was measured by means of mass spectrometry under conditions of high or low levels of violaxanthin, being transformed to zeaxanthin during dark incubation in an ascorbate containing buffer at pH 5.7. Analysis of oxygen evolution and of light-induced oxygen uptake indicate that the de-epoxidation of violaxanthin to zeaxanthin results in an increased cyclic electron transport around PS II, thus dimishing the vectorial electron flow from water. An effect similar to de-epoxidation was observed after incubation of thylakoid membranes with specific antibodies against violaxanthin.

The Xanthophyll Cycle in Green Algae (Chlorophyta): Its Role in the Photosynthetic Apparatus

Plant Biology ◽  
2004 ◽  
Vol 6 (3) ◽  
pp. 342-349 ◽  
Author(s):  
J. Masojídek ◽  
J. Kopecká ◽  
M. Koblížek ◽  
G. Torzillo
Keyword(s):  
Green Algae ◽  
Xanthophyll Cycle ◽  
Photosynthetic Apparatus

scholarly journals Mechanisms shaping the synergism of zeaxanthin and PsbS in photoprotective energy dissipation in the photosynthetic apparatus of plants

2021 ◽  
Author(s):  
Renata Welc ◽  
Rafal Luchowski ◽  
Dariusz Kluczyk ◽  
Monika Zubik ◽  
Wojciech Grudzinski ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Xanthophyll Cycle ◽  
Molecular Mechanisms ◽  
Molecular Spectroscopy ◽  
Imaging Techniques ◽  
Photophysical Properties ◽  
Photosynthetic Apparatus ◽  
Strong Light ◽  
Thylakoid Membrane Proteins ◽  
Photo Damage

AbstractSafe operation of photosynthesis is vital to plants and is ensured by the activity of numerous processes protecting chloroplasts against photo-damage. The harmless dissipation of excess excitation energy is believed to be the main photoprotective mechanism and is most effective with the simultaneous presence of PsbS protein and zeaxanthin, a xanthophyll accumulated in strong light as a result of the xanthophyll cycle activity. Here we address the problem of specific molecular mechanisms underlying the synergistic effect of zeaxanthin and PsbS. The experiments were conducted with Arabidopsis thaliana, the wild-type and the mutants lacking PsbS (npq4) and affected in the xanthophyll cycle (npq1), with the application of multiple molecular spectroscopy and imaging techniques. Research results lead to the conclusion that PsbS interferes with the formation of tightly packed aggregates of thylakoid membrane proteins, thus enabling the incorporation of xanthophyll cycle pigments into such structures. It was found that xanthophylls trapped within supramolecular structures, most likely in the interfacial protein region, determine their photophysical properties. The structures formed in the presence of violaxanthin are characterized by minimized dissipation of excitation energy. In contrast, the structures formed in the presence of zeaxanthin show enhanced excitation quenching, thus protecting the system against photo-damage.

Characterization of a nonphotochemical quenching-deficient Arabidopsis mutant possessing an intact PsbS protein, xanthophyll cycle and lumen acidification

Planta ◽  
2005 ◽  
Vol 223 (3) ◽  
pp. 532-541 ◽  
Author(s):  
Ljudmila Kalituho ◽  
Thomas Graßes ◽  
Maria Graf ◽  
Jennifer Rech ◽  
Peter Jahns
Keyword(s):  
Xanthophyll Cycle ◽  
Nonphotochemical Quenching ◽  
Arabidopsis Mutant ◽  
Psbs Protein
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