Uptake and partitioning of Na+ and Cl− in plants of soybean (Glycine max L. Merr. cv. Hodgson) exposed to moderate NaCl concentrations were studied over an 8‐day period. Plants showed marked retention of Na+ in the stems and low transport to laminae of young leaves. The xylem sap ascending the main axis was progressively depleted in Na+. The oldest leaf greatly contributed to Na+ depletion of the sap flowing to younger leaves. These results in combination with estimates of phloem recirculation indicated that Na+ accumulation in the young leaf was prevented both by depletion of Na+ from the xylem stream, and by a high recirculation of Na+ via the phloem. However, this protection of young leaves was effective only for very mild salinity treatment.
No takes yet. Share an insight, caveat, or question.
Durand et al. (1994) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: