title: [Period-lengthening and phase-shifting of the circadian rhythm of Phaseolus coccineus L. by theorphylline].
abstract: Under the continuous influence of theophylline the period of the circadian leaf movement rhythm of Phaseolus is lengthened under conditions of continuous darkness and under conditions of continuous light. Four-h pulses of theophylline shift the rhythm as a function of the phase.It is hypothesized that these theophylline effects are based not upon inhibition of the phosphodiesterase which hydrolyses 3',5'-cAMP but on the influence on membrane function, particularly the transport and binding of Ca(2+).
authors.affiliation: Institut für Biologie I der Universität Tübingen, Auf der Morgenstelle 1, D-7400, Tübingen, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Mayer
authors.forename: R
authors.initials: R
authors.lastname: Gruner
authors.forename: H
authors.initials: H
authors.lastname: Strubel