Abstract— …Phototransformations of the red/far red reversible plant pigment phytochrome involve several intermediates. At 77K, lumi‐F, the initial product of phototransformation of the far red absorbing form Pfr and some of its relaxation products are shown to undergo further phototransformations. Lumi‐F has an absorption maximum in the region 690–730nm. The product, giving rise to a maximum in the difference spectra at 650nm, formerly thought to be lumi‐F, is now believed to represent one of its relaxation products. The nature of the reactions connecting these various intermediates are discussed.
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Spruit et al. (1977) studied this question.
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