scholarly journals Long-term acclimatory response to excess excitation energy: evidence for a role of hydrogen peroxide in the regulation of photosystem II antenna size

2015 ◽  
Vol 66 (22) ◽  
pp. 7151-7164 ◽  
Author(s):  
Maria M. Borisova-Mubarakshina ◽  
Boris N. Ivanov ◽  
Daria V. Vetoshkina ◽  
Valeriy Y. Lubimov ◽  
Tatyana P. Fedorchuk ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Photosystem Ii ◽  
Excitation Energy ◽  
Antenna Size ◽  
Acclimatory Response

The role of ΔpH-dependent dissipation of excitation energy in protecting photosystem II against light-induced damage in Arabidopsis thaliana

2002 ◽  
Vol 40 (1) ◽  
pp. 41-49 ◽  
Author(s):  
Thomas Graßes ◽  
Paolo Pesaresi ◽  
Fabio Schiavon ◽  
Claudio Varotto ◽  
Francesco Salamini ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Photosystem Ii ◽  
Excitation Energy

scholarly journals Photosystem II Heterogeneity and Long-Term Acclimation of Light-Harvesting

1989 ◽  
Vol 44 (5-6) ◽  
pp. 403-406 ◽  
Author(s):  
Pirkko Mäenpää ◽  
Bertil Andersson
Keyword(s):  
Photosystem Ii ◽  
Low Light ◽  
Lhc Ii ◽  
Antenna Size ◽  
Long Term Changes ◽  
Stroma Lamellae ◽  
Photosystem Ii Heterogeneity ◽  
Specific Increase ◽  
Spinach Thylakoids

Abstract The main chlorophyll a/b protein complex of the chloroplast thylakoid membrane is organized into two subpopulations; one inner which is tightly bound to the photosystem II core and one outer which is bound more loosely or peripherally. In this study, changes in the LHC II com position due to long-term light acclimation were analyzed and quantified in spinach thylakoids and isolated stroma lamellae vesicles. The results show that; photosystem II located in the appressed thylakoid regions (α-centres) which have a relatively large antenna size, contains both the inner and outer LHC II with a predominance of the latter (58-70%). At low light the antenna size o f the α-center becomes larger due to a specific increase of the outer pool o f LHC II. The antenna size of photosystem II in the stroma thylakoids (β-centres) is smaller and contains mainly or only the inner LHC II pool. In contrast to the α-centres the β-centres centres do not undergo adaptive changes in their size in response to long-term changes in the light intensities.

scholarly journals Photosynthetic Antenna Size Regulation as an Essential Mechanism of Higher Plants Acclimation to Biotic and Abiotic Factors: The Role of the Chloroplast Plastoquinone Pool and Hydrogen Peroxide

2021 ◽  
Author(s):  
Maria M. Borisova-Mubarakshina ◽  
Ilya A. Naydov ◽  
Daria V. Vetoshkina ◽  
Marina A. Kozuleva ◽  
Daria V. Vilyanen ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Hydrogen Peroxide ◽  
Higher Plants ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Biotic Factors ◽  
Antenna Size ◽  
Plastoquinone Pool ◽  
Abiotic And Biotic Factors

The present chapter describes the mechanisms of reactive oxygen species formation in photosynthetic reactions and the functional significance of reactive oxygen species as signal messengers in photosynthetic cells of plants. Attention is given to the acclimation mechanisms of higher plants to abiotic and biotic factors such as increased light, drought, soil salinity and colonization of plants by rhizosphere microorganisms. Special attention is paid to the reactions of reactive oxygen species with the components of the chloroplasts plastoquinone pool leading to production of hydrogen peroxide as a signal molecule, which is involved in acclimation of plants to these stress conditions. The chapter also presents the data demonstrating that regulation of the size of the light-harvesting antenna of photosystem II is one of the universal mechanisms of the structural and functional reorganization of the photosynthetic apparatus of higher plants exposed to the abiotic and biotic factors. These data were obtained for both model Arabidopsis (Arabidopsis thaliana) plants as well as for agricultural barley (Hordeum vulgare) plants. It is hypothesized that hydrogen peroxide, produced with involvement of the plastoquinone pool components, plays the role of a signaling molecule for regulation of the photosystem II antenna size in higher plants when environmental conditions change.

Research note: Energy partitioning in photosystem II complexes subjected to photoinhibitory treatment

2007 ◽  
Vol 34 (3) ◽  
pp. 214 ◽  
Author(s):  
Dmytro Kornyeyev ◽  
Luke Hendrickson
Keyword(s):  
Electron Transport ◽  
Photosystem Ii ◽  
Excitation Energy ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Photosynthetic Electron Transport ◽  
Energy Partitioning ◽  
Simple Equations

Chlorophyll a fluorescence measured in vivo is frequently used to study the role of different processes influencing the distribution of excitation energy in PSII complexes. Such studies are important for understanding the regulation of photosynthetic electron transport. However, at the present time, there is no unified methodology to analyse the energy partitioning in PSII. In this article, we critically assess several approaches recently developed in this area of research and propose new simple equations, which can be used for de-convolution of non-photochemical energy quenching in PSII complexes.

Relationship between Excitation Energy Transfer, Trapping, and Antenna Size in Photosystem II†

Biochemistry ◽  
2001 ◽  
Vol 40 (13) ◽  
pp. 4026-4034 ◽  
Author(s):  
Laura M. C. Barter ◽  
Maria Bianchietti ◽  
Chris Jeans ◽  
Maria J. Schilstra ◽  
Ben Hankamer ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Photosystem Ii ◽  
Excitation Energy ◽  
Excitation Energy Transfer ◽  
Antenna Size

Abusive head trauma (AHT) outcome at long-term follow-up and the role of elective neurosurgical approach: A report of 22 cases

2013 ◽  
Author(s):  
Francesca Menegazzo ◽  
Melissa Rosa Rizzotto ◽  
Martina Bua ◽  
Luisa Pinello ◽  
Elisabetta Tono ◽  
...  
Keyword(s):  
Head Trauma ◽  
Abusive Head Trauma ◽  
Long Term Follow Up

The Second Start of Transformation in Ukraine?

2014 ◽  
pp. 30-52 ◽  
Author(s):  
L. Grigoryev ◽  
E. Buryak ◽  
A. Golyashev
Keyword(s):  
Economic Growth ◽  
Armed Conflict ◽  
Political Crisis ◽  
Investment Climate ◽  
Institutional Reforms ◽  
Personal Consumption ◽  
Governance Quality ◽  
Political Turmoil

The Ukrainian socio-economic crisis has been developing for years and resulted in the open socio-political turmoil and armed conflict. The Ukrainian population didn’t meet objectives of the post-Soviet transformation, and people were disillusioned for years, losing trust in the state and the Future. The role of workers’ remittances in the Ukrainian economy is underestimated, since the personal consumption and stability depend strongly on them. Social inequality, oligarchic control of key national assets contributed to instability as well as regional disparity, aggravated by identity differences. Economic growth is slow due to a long-term underinvestment, and prospects of improvement are dependent on some difficult institutional reforms, macro stability, open external markets and the elites’ consensus. Recovering after socio-economic and political crisis will need not merely time, but also governance quality improvement, institutions reform, the investment climate revival - that can be attributed as the second transformation in Ukraine.

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