X-ray microanalysis of ion distribution within root cortical cells of the halophyte Suaeda maritima (L.) Dum.

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Abstract
The ion content of compartments within cortical cells of mature roots of the halophyte Suaeda maritima grown at 200 mol·m-3 NaCl has been studied by X-ray microanalysis of freeze-substituted thin sections. Sodium and Cl were found in the vacuoles at about four-times the concentration in the cytoplasm or cell walls, whereas K was more concentrated in the cell walls and cytoplasm than in vacuoles. The vacuolar Na concentration was 12- to 13-times higher than that of K. The Na concentration of cell walls of cortical cells was about 95 mol·m-3 of analysed volume. The cytoplasmic K concentration within the mature cortical cells was estimated to be 55 mol·m-3 of analysed volume.