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Effect of K + and H + stress and role of Ca2 + in the regulation of intracellular K + concentration in mung bean roots
Author(s) -
Torimitsu Keiichi,
Hayashi Makoto,
Ohta Eiji,
Sakata Makotu
Publication year - 1985
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.1399-3054.1985.tb04260.x
Subject(s) - vigna , mung bean , intracellular , chemistry , pi , atpase , nuclear chemistry , biophysics , botany , biochemistry , biology , enzyme , food science
The effects of external K + , H + and Ca2 + concentrations on the intracellular K+ concentration, [K + ]i, and the K + ‐ATPase activity in 2‐day‐old mung bean roots [ Vigna mungo (L.) Hepper] were investigated. [K + ]i, in mung bean roots was markedly decreased by external K + or H + stress and did not recover the initial value even after the stress was removed. This decrease in [K + ]i, gradually disappeared with the addition of (Ca2 + . Ca2 + may offset the harmful effects of ion stress. Ca2 + seems to have two effects on K+ transport; control of K + permeability and activation of K + uptake, although K + ‐ATPase activity was inhibited by Ca2 + concentrations higher than 10–4 M. We suggest that Ca2 + activates K + uptake indirectly through the acidification of the cytoplasm.