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Ion Uptake in Higher Plants and KCl Stimulation of Plasmalemma Adenosine Triphosphatase: Comparison of Models
Author(s) -
NISSEN PER
Publication year - 1977
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.1399-3054.1977.tb04058.x
Subject(s) - adenosine triphosphatase , kinetics , atpase , stimulation , chemistry , ion , biophysics , ion transporter , membrane , biochemistry , enzyme , biology , physics , organic chemistry , quantum mechanics , neuroscience
Criteria for the acceptance or rejection of the dual, the cooperative, and the multiphasic model of ion uptake are given and are used to evaluate the models on the basis of previously published analyses. In addition, mathematical representations of the models are fitted to concentration‐dependence data for various ions and plant tissues by a general curve fitting program. The calculated parameters are evaluated for biological relevance, and the fit is compared by statistical analysis. The kinetics of ion uptake in higher plants are found to be consistent with the concept of multiphasic uptake mechanisms, while the dual and the cooperative model must be rejected. KCl stimulation of plasmalemma‐bound ATPases is also shown to obey multiphasic kinetics, thus strengthening the correlation between ion uptake and membrane‐bound ATPases.