Circadian expression of the light-harvesting protein of Photosystem II in etiolated bean leaves following a single red light pulse: Coordination with the capacity of the plant to form chlorophyll and the thylakoid-bound protease

1995 ◽  
Vol 44 (1-2) ◽  
pp. 93-106 ◽  
Author(s):  
T. Bei-Paraskevopoulou ◽  
R. Anastassiou ◽  
J. Argyroudi-Akoyunoglou
Keyword(s):  
Photosystem Ii ◽  
Light Pulse ◽  
Light Harvesting ◽  
Red Light ◽  
Circadian Expression ◽  
Bean Leaves

scholarly journals Uphill energy transfer mechanism for photosynthesis in the Antarctic alga

2021 ◽  
Author(s):  
Makiko Kosugi ◽  
Masato Kawasaki ◽  
Yutaka Shibata ◽  
Kojiro Hara ◽  
Shinichi Takaichi ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Photosystem Ii ◽  
Excitation Energy ◽  
High Efficiency ◽  
Light Harvesting ◽  
Red Light ◽  
Excitation Energy Transfer ◽  
Energy Transfer Mechanism ◽  
Light Harvesting Complex ◽  
Prasiola Crispa

Abstract Prasiola crispa, a major green alga in Antarctica, forms layered colonies for survival under the severe terrestrial conditions of Antarctica, which include severe cold, drought, and strong sunlight. As a result of these conditions, the surface cells of P. crispa and other Antarctic organisms face high risk of photodamage. Cells of deeper layer escape from photodamage at the sacrifice of photosynthetic active radiation except infrared. P. crispa achieves effective photosynthesis by low energy far-red light for photosystem II excitation with high efficiency similar to that of visible light. Here, we identified a far-red light-harvesting complex of photosystem II in P. crispa, Pc-frLHC, and proposed a molecular mechanism of uphill excitation energy transfer based on its cryogenic electron-microscopy structure. While Pc-frLHC is associated with photosystem II, it is evolutionarily related to the light-harvesting complex of photosystem I. Pc-frLHC forms a ring-shaped homo-undecamer in which all chlorophyll a molecules are energetically connected and contains chlorophyll a trimers. It seems that the trimers are long-wavelength-absorbing chlorophylls for far-red light at 708 nm, and further absorbance extension is accomplished by Davydov-splitting in dimeric chlorophylls. The chlorophyll network should enable a highly efficient entropy-driven uphill excitation energy transfer using far-red light up to 725 nm.

scholarly journals The natural design for harvesting far-red light: the antenna increases both absorption and quantum efficiency of Photosystem II

2021 ◽  
Author(s):  
Vincenzo Mascoli ◽  
Ahmad Farhan Bhatti ◽  
Luca Bersanini ◽  
Herbert van Amerongen ◽  
Roberta Croce
Keyword(s):  
Photosystem Ii ◽  
Charge Separation ◽  
Light Harvesting ◽  
Structural Information ◽  
Red Light ◽  
Time Resolved Fluorescence ◽  
Light Harvesting Complexes ◽  
Time Resolved ◽  
Light Energy Conversion ◽  
Chlorophyll F

Cyanobacteria carry out photosynthetic light-energy conversion using phycobiliproteins for light harvesting and the chlorophyll-rich photosystems for photochemistry. While most cyanobacteria only absorb visible photons, some of them can acclimate to harvest far-red light (FRL, 700-800 nm) by integrating chlorophyll f and d in their photosystems and producing red-shifted allophycocyanin. Chlorophyll f insertion enables the photosystems to use FRL but slows down charge separation, reducing photosynthetic efficiency. Here we demonstrate with time-resolved fluorescence spectroscopy that charge separation in chlorophyll-f-containing Photosystem II becomes faster in the presence of red-shifted allophycocyanin antennas. This is different from all known photosynthetic systems, where additional light-harvesting complexes slow down charge separation. Based on the available structural information, we propose a model for the connectivity between the phycobiliproteins and Photosystem II that qualitatively accounts for our spectroscopic data. This unique design is probably important for these cyanobacteria to efficiently switch between visible and far-red light.

On the nature of plasmon-induced photocurrent enhancement in Bacteriochlorophyll c sensitized solar cells: Towards red light harvesting

2021 ◽  
Vol 258 ◽  
pp. 123932
Author(s):  
Lekha Peedikakkandy ◽  
Ondřej Pavelka ◽  
Martina Alsterová ◽  
Anna Fučíková ◽  
Jakub Dostál ◽  
...  
Keyword(s):  
Solar Cells ◽  
Light Harvesting ◽  
Red Light ◽  
Bacteriochlorophyll C ◽  
Sensitized Solar Cells

The Relationship between the Binding of Dicyclohexylcarbodiimide and Quenching of Chlorophyll Fluorescence in the Light-Harvesting Proteins of Photosystem II†

Biochemistry ◽  
1998 ◽  
Vol 37 (33) ◽  
pp. 11586-11591 ◽  
Author(s):  
Alexander V. Ruban ◽  
Paolo Pesaresi ◽  
Ulrich Wacker ◽  
Klaus-Dieter J. Irrgang ◽  
Roberto Bassi ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Photosystem Ii ◽  
Light Harvesting ◽  
The Relationship
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