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PLANT PHYSIOLOGY , Vol 110, Issue 2 705-711, Copyright © 1996 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Na+-K+ Exchange at the Xylem/Symplast Boundary (Its Significance in the Salt Sensitivity of Soybean)
D. Lacan and M. Durand
Laboratoire de Recherches sur les Substances Naturelles Vegetales, Universite Montpellier II, Sciences et Techniques du Languedoc, Place E, Bataillon, 34095 Montpellier Cedex 5, France
We investigated the mechanism of Na+ reabsorption in exchange for K+ at the
xylem/symplast boundary of soybean roots (Glycine max var Hodgson). The
xylem vessels of excised roots were perfused with solutions of defined
composition to discriminate between entry of ions into or reabsorption from
the xylem vessels. In the presence of NaCl, the transport systems released
K+ into the xylem sap and reabsorbed Na+. The Na+-K+ exchange was energized
by proton-translocating ATPases, enhanced by external K+ concentration, and
dependent on the anion permeability. Evidence was presented for the
operation of H+/Na+ and H+/K+ antiporters at the xylem/symplast interface.
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