[Period-lengthening and Phase-shifting of the Circadian Rhythm of Phaseolus Coccineus L. by Theorphylline]
Affiliations
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+).
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