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The non-invasive ion-selective electrode closed to the root (A) and net Na+ fluxes in roots of tetraploid (closed symbols) and diploid (open symbols) honeysuckle exposed to 0 (circles) and 300 mM (triangles) NaCl (B). Na+ fluxes were measured along root axes (0–3000 μm from the apex) at interval of 500 μm. Each point is the mean of five individual plants.
