Phytochrome in Seeds and an Apparent Dark Reversion of Pr to Pfr
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1968
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In seeds of Lactuca sativa 'May Queen', Nemophila insignis and Sinapis alba, photoreversible absorption changes due to phytochrome, or a similar pigment, could be observed after a few hours imbibition. In dark-imbided seeds of Lactuca and Nemophila, the greater part of the pigment was present in the far red absorbing form. After phototransformation to the red absorbing form, a relatively short period of darkness resulted in renewed transformability of the pigment by far red radiation. One way of interpreting this finding is to assume a dark transformation in these seeds of the red absorbing to the far red absorbing pigment form.
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Meded. Landbouwhogeschool Wageningen, Nederland 68-17(1968)