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The influences of calcium and magnesium ions on the exchange of monovalent cations in Neurospora crassa
Author(s) -
Sancho Enrique D.,
RodríguezNavarro Alonso
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.tb05604.x
Subject(s) - neurospora crassa , magnesium , calcium , efflux , chemistry , ion exchange , strain (injury) , sodium , ion , nuclear chemistry , biochemistry , biology , anatomy , gene , organic chemistry , mutant
Low‐K + , high‐Na + cells of strain RL21a of Neurospora crassa , in steady state with 25 m M Na + , were used to study K + /Na + exchanges in the presence or absence of Ca 2+ and Mg 2+ . In the presence of Ca 2+ and Mg 2+ , a low concentration of K + (0.3 m M ) triggered a rapid exchange, but in the absence of the divalents, a high K + concentration (30 m M ) was required to initiate the exchange at a rapid rate. In the absence of Ca 2+ and Mg 2+ , K + uptake did not occur at low K + concentration, internal K + did not regulate Na + influx in the presence of external K + , and the efflux of Na + proceeded at maximum activity at very low‐K + contents.