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Rapid sodium cycling across the plasma membrane of root cells is widely thought to be associated with Na +  toxicity in plants. However, the eux component of this cycling is not well understood. Eux of Na +  from root cells is believed to be mediated by Salt Overly-Sensitive-1, although expression of this Na + /H +  antiporter has been localized to the vascular tissue and root meristem. Here, we used a chambered cuvette system in which the distal root of intact salinized barley and  Arabidopsis thaliana  plants (wild-type and  sos1 ) were isolated from the bulk of the root by a silicone-acrylic barrier, so that we could compare patterns of  24 Na +  eux in these two regions of root. In barley, steady-state release of  24 Na +  was about four times higher from the distal root than from the bulk roots. In the distal root,  24 Na +  release was pronouncedly decreased by elevated pH (9.2), while the bulk-root release was not significantly affected. In  A. thaliana , tracer eux was about three times higher from the wild-type distal root than from the wild-type bulk root and also three to four times higher than both distal- and bulk-root fluxes of  Atsos1  mutants. Elevated pH also greatly reduced the eux from wild-type roots. These findings support a significant role of SOS1-mediated Na +  eux in the distal root, but not in the bulk root.

Measurement of Differential Na+ Eﬄux from Apical and Bulk Root Zones of Intact Barley and Arabidopsis Plants