title: Short-term reactions of phytochrome in Mougeotia?
abstract: Phytochrome controlled chloroplast movement in Mougeotia is induced by flashes of polarized red light. Two subsequent flashes, separated by a dark interval of a few seconds, are much more effective than two simultaneous flashes; a maximal cumulative effect is reached if the duration of the dark interval is 30 ms or longer. We propose two light reactions in series, separated by a very fast dark reaction. Preliminary evidence is given that the energy requirement for these light reactions is different. It is suggested that the two reactions are related in some way to free and bound phytochrome.
authors.affiliation: Institut für Botanik und Pharmazeutische Biologie, Schloßgarten 4, D-8520, Erlangen, Federal Republic of Germany.
authors.forename: W
authors.initials: W
authors.lastname: Haupt
authors.forename: N
authors.initials: N
authors.lastname: Bretz