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Journal Articles Science Year : 2018

Photochemistry beyond the red limit in chlorophyll f–containing photosystems

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Abstract

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.

Dates and versions

cea-01886154 , version 1 (02-10-2018)

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Dennis Nürnberg, Jennifer Morton, Stefano Santabarbara, Alison Telfer, Pierre Joliot, et al.. Photochemistry beyond the red limit in chlorophyll f–containing photosystems. Science, 2018, 360 (6394), pp.1210 - 1213. ⟨10.1126/science.aar8313⟩. ⟨cea-01886154⟩
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