Sodium Does Not Compete with Calcium in Saturating Plasma Membrane Sites Regulating 22Na Influx in Salinized Maize Roots
Open Access
- 1 May 1991
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 96 (1) , 331-334
- https://doi.org/10.1104/pp.96.1.331
Abstract
Half maximal inhibition of sodium (22Na+) influx into maize (Zea mays L.) root segments incubated in solutions containing from 0.25 to 100 millimolar NaCl was consistently attained with external calcium activity at 0.26 ± 0.10 millimolar. Sodium ions do not appear to compete with calcium during initial binding to sites on the plasma membrane that participate in the regulation of sodium influx under saline conditions.Keywords
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