title: On the nature of the photosynthetic energy storage monitored by photoacoustic spectroscopy.
abstract: The photosynthetic energy storage yield of uncoupled thylakoid membranes was monitored by photoacoustic spectroscopy at various measuring beam intensities. The energy storage rate as evaluated by the half-saturation measuring beam intensity (i50) was inhibited by 3-(3,4-dichlorophenyl)-1,1 dimethylurea, by heat inactivation or by artificial electron acceptors specific for photosystem I or photosystem II; and was activated by electron donors to photosystem I. The reactions involving both photosystems were all characterized by a similar maximal energy storage yield of 16±2 percent. The data could be interpreted if we assumed that the energy storage elicited by the photosystems at 35 Hz is detected at the level of the plastoquinone pool.
authors.affiliation: Centre de Recherche en Photobiophysique, Université de Québec à Trois-Rivières, 3351, Boul. des Forges, C.P. 500, G9A 5H7, Trois-Rivières, Québec, Canada.
authors.forename: R
authors.initials: R
authors.lastname: Carpentier
authors.forename: R M
authors.initials: RM
authors.lastname: Leblanc
authors.forename: M
authors.initials: M
authors.lastname: Mimeault