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Photochemistry beyond the red limit in chlorophyll f–containing photosystems

Photosystems I and II convert solar energy into the chemical energy that powers life. Chlorophyll a photochemistry, using red light (680 to 700 nm), is near universal and is considered to define the energy "red limit" of oxygenic photosynthesis. We present biophysical studies on the photosystems from a cyanobacterium grown in far-red light (750 nm). The few long-wavelength chlorophylls present are well resolved from each other and from the majority pigment, chlorophyll a. Charge separation in photosystem I and II uses chlorophyll f at 745 nm and chlorophyll f (or d) at 727 nm, respectively. Each photosystem has a few even longer-wavelength chlorophylls f that collect light and pass excitation energy uphill to the photochemically active pigments. These photosystems function beyond the red limit using far-red pigments in only a few key positions.

Authors:   Dennis J. Nürnberg; Jennifer Morton; Stefano Santabarbara; Alison Telfer; Pierre Joliot; Laura A. Antonaru; Alexander V. Ruban; Tanai Cardona; Elmars Krausz; Alain Boussac; Andrea Fantuzzi; A. William Rutherford
Journal:   Science
Volume:   360
edition:   6394
Year:   2018
Pages:   1210
DOI:   10.1126/science.aar8313
Publication date:   15-Jun-2018
Facts, background information, dossiers
  • chlorophyll
  • Energy
  • light
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