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Effects of alkali ions on the circadian leaf movements of Oxalis regnellii
Author(s) -
Rinnan T.,
Johnsson A.
Publication year - 1986
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1986.tb01246.x
Subject(s) - circadian rhythm , ion , period (music) , transpiration , alkali metal , chemistry , biophysics , phase (matter) , biology , biochemistry , physics , endocrinology , photosynthesis , organic chemistry , acoustics
The influence of alkali ions on the circadian leaf movements of Oxalis regnellii Mig. was investigated. Ions were given to the oscillating system via the transpiration stream of cut stalks in nutrient medium. Chloride solutions of Rb + , Cs + , Na + and K + were tested and the results compared to previously published LiCl‐results. The period of the circadian leaf movements was unaffected by a continual addition of Na + or K + to the nutrient medium (at least up to 40 m M ). Rb + , in the concentration of 2.5 or 5 m M , caused a shortening of the period when applied continuously. Rb + concentrations up to 60 m M were tested. Cs + ions caused only lengthenings of the circadian period. Cs + concentrations up to 40 m M were tested. Cs + resembled Li + in producing period lengthenings, but was not as effective as Li + when compared on a concentration basis. Toxicity of the effective ions was in the following order: Li + Cs + Rb + , Rb + pulses (50 m M , 4 h) phase‐shifted the rhythm and caused advances. A phase response curve was determined and the maximum steady state advances were of the order of 1 h. The dual effect of the Rb + ions is discussed and is assumed to be due to two counteracting processes, exemplified by Rb + ‐sensitive ATPase‐controlled pumping processes and protein synthesis. For comparison, the effects of Rb + and Li + in human depressive disorders is also discussed in relation to their influence on circadian systems. It is emphasized that Rb + and K + behave differently and are not interchangeable in their action on circadian systems.