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Stimulation of proton extrusion by K + and divalent cations (Ni 2+ , Co 2+ Zn 2+ ) in maize root segments
Author(s) -
Cocucci Sergio M.,
Morgutti Silvia
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.tb03388.x
Subject(s) - divalent , incubation , stimulation , chemistry , nuclear chemistry , inorganic chemistry , radiochemistry , biochemistry , biology , organic chemistry , neuroscience
Entry of the divalent cations Ni 2+ , Co 2+ and Zn 2+ into cells of maize ( Zea mays L. cv. Dekalb XL 85) root tissue is accompanied by an acidification of the incubation medium, a decrease in both the pH of the cell sap and the level of malate in the cells, and by an inhibition of dark fixation of CO 2 . K + , on the contrary, induces only a very low acidification of the incubation medium, does not change either the pH of the cell sap or the malate level in the cells, and induces an increase in CO 2 dark fixation. Different mechanisms are postulated for the stimulation of proton extrusion by divalent cations and K + .