Boisard, J.Spruit, C.J.P.Rollin, P.2014-09-102014-09-101968Meded. Landbouwhogeschool Wageningen, Nederland 68-17(1968)http://hdl.handle.net/123456789/5588In 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.enArticle