SPECTRAL EVIDENCE FOR A NEW PHOTOREACTIVE COMPONENT OF THE OXYGEN-EVOLVING SYSTEM IN PHOTOSYNTHESIS
- 1 July 1969
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 63 (3), 963-969
- https://doi.org/10.1073/pnas.63.3.963
Abstract
On illuminating chloroplasts with "short-wavelength" monochromatic light that supports oxygen evolution, spectral evidence was obtained for a new photoreactive chloroplast component, provisionally designated C550, which shows a reversible decrease of absorbance with a maximum at 550 mmu. The light-induced absorbance changes in C550 have been separated from those due to cytochromes in the same spectral region.The light-induced decrease of absorbance in C550 appears to be independent of temperature, persisting even at -189 degrees and is therefore likely to be linked to the primary light reaction associated with oxygen evolution in photosynthesis.Keywords
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