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Turgor‐ dependent membrane permeability in relation to calcium level
Author(s) -
Enoch Sarai,
Glinka Zvi
Publication year - 1983
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.1399-3054.1983.tb00758.x
Subject(s) - turgor pressure , chemistry , calcium , membrane , mannitol , biophysics , cell permeability , daucus carota , membrane permeability , permeability (electromagnetism) , low calcium , biochemistry , botany , biology , organic chemistry
The relationship between the inhibiting effect of Ca 2+ and of low turgor pressure on K + release from fresh‐cut discs of carrot ( Daucus carota var. Nantes) storage tissue was studied. A range of Ca 2+ concentrations in the tissue was obtained by adding 0.5 m M EDTA or CaSO 4 at different concentrations to the medium. Calcium inhibited K + release in fully turgid cells (2.5 μmol K + g −1 h −1 in 0.5 m M EDTA vs 0.4 μmol K + g −1 h −1 in 10 m M CaSO 4 ). Less turgid cells, obtained by equilibration with 0.2 M mannitol, released K + at only 30% of the rate of the turgid cells, yet the pattern of K + release as a function of Ca 2+ level was similar in both turgid and non‐turgid cells. Removal of calcium by EDTA occasionally injured cell membranes in the fully turgid discs but never in the less turgid ones. In view of the additive effect of Ca 2+ and low turgor on K + release regardless of the treatment order, it is suggested that the two factors exert their effect on membrane permeability independently of each other.