title: Evidence for an electrogenic and a non-electrogenic component in the slow phase of the P515 response in chloroplasts.
abstract: The flash-induced P515 absorbance change in intact chloroplasts consists of a fast and a slow phase. There is disagreement in the literature over the origin of the slow phase. Here we argue that the flash-induced slow phase in P515 absorbance change is composed of two different components. One component is most probably due to the electrogenic Q-cycle associated with the cytochrome b/f complex. The second component has decay kinetics that are much slower than the electrogenic reactions. We suggest that the second component is due to a non-electrogenic reaction.
authors.affiliation: Laboratory of Plant Physiological Research, Agricultural University, Gen. Foulkesweg 72, 6703 BW, Wageningen, The Netherlands.
authors.forename: J J
authors.initials: JJ
authors.lastname: Ooms
authors.forename: W J
authors.initials: WJ
authors.lastname: Vredenberg
authors.forename: W F
authors.initials: WF
authors.lastname: Buurmeijer