title: Leaflet movement of Mimosa pudica L. Indicative of phytochrome action.
abstract: 1. Closing movements of Mimosa pudica pinnae, upon change from light to darkness, depend upon the presence of phytochrome in the far-red-absorbing form. 2. The potentiated control of closing movements by phytochrome can be repeatedly established and reversed by repeated alternations of red and far-red radiation, respectively. 3. Action spectra were measured for the potentiation of closure and for its reversal. 4. The response to phytochrome action is evident in 5 minutes and is fully expressed in 30 minutes. 5. This rapid response and the more rapid potentiation with half times of less than 1 minute for several other responses to phytochrome action indicate that the primary action of phytochrome ist not gene activation, but rather metabolic control at the substrate level.
authors.affiliation: Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Md..
authors.forename: J C
authors.initials: JC
authors.lastname: Fondeville
authors.forename: H A
authors.initials: HA
authors.lastname: Borthwick
authors.forename: S B
authors.initials: SB
authors.lastname: Hendricks