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Evidence for Hormonal Regulation of the Selectivity of Ion Uptake by Plant Cells
Author(s) -
ILAN I.
Publication year - 1971
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.1399-3054.1971.tb01433.x
Subject(s) - kinetin , helianthus annuus , selectivity , cytokinin , sunflower , absorption (acoustics) , sodium , cotyledon , botany , chemistry , biophysics , biology , biochemistry , horticulture , tissue culture , auxin , in vitro , gene , physics , organic chemistry , acoustics , catalysis
Kinetin exerted opposing effects on the uptake of K + and of Na + by leaf discs of Helianthus annuus: The absorption of K + was stimulated and that of Na+ was inhibited. The K + /Na + ratio in kinetin‐treated discs was 80–100 % higher than in control tissue. Kinetin also promoted K + uptake by detached cotyledons which had been removed from light‐grown seedlings. On the other hand, no clear effect on the absorption of Na + by these cotyledons could be established. Benzyladenine brought about a significant elevation in the K + /Na + ratio in attached cotyledons. It is concluded that cytokinins bring about a change in the selectivity of the cells of sunflower leaves and cotyledons towards K + and Na + , such that the ‘affinity’ of the cells for pottasium is increased, as compared to the ‘affinity’ for sodium. The possible significance of such a change in selectivity is discussed.