X-ray microanalysis of ion distribution within root cortical cells of the halophyte Suaeda maritima (L.) Dum. |
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Authors: | M A Hajibagheri T J Flowers |
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Institution: | (1) School of Biological Sciences, University of Sussex, BN1 9QG Brighton, U.K. |
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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. |
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Keywords: | Compartmentation subcellular Halophyte Ion distribution (cell) Root cortex (ion distribution) Salt tolerance Suaeda (ion distribution) |
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