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The absorption and translocation of sodium by maize seedlings

Summary

The absorption and subsequent distribution of sodium and potassium has been examined in maize seedlings in short-term experiments using sodium-22 and potassium-42. The absorption and translocation of sodium by different segments of intact seedlings was also investigated. Although absorption of potassium exceeded that of sodium by a factor of about 50, there was no evidence that the entry of sodium was confined to a small region of the root. Determinations of the relative quantities of sodium and potassium in the xylem exudate of detached roots showed that the ratio of sodium to potassium decreased with increasing length of the root. These results suggested that upward movement of sodium in the xylem vessels was progressively reduced towards the basal part of the root. This conclusion was supported by microautoradiographs, which showed that although the concentration of sodium within the endodermis was greater than that in the cortex, there was an apparent decrease in the sodium content of the major xylem vessels at the basal end of the root.

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References

  1. Appleton, T. C.: Resolving power, sensitivity and latent image fading of soluble-compound autoradiographs. J. Histochem. Cytochem. 14, 414–419 (1966).

  2. Bange, G. G. J., and E. Van Vliet: Translocation of potassium and sodium in intact maize seedlings. Plant and Soil 15, 312–328 (1961).

  3. Barber, D. A., J. Sanderson, and R. S. Russell: Influence of microorganisms on the distribution in roots of phosphate labelled with phosphorus-32. Nature (Lond.) 217, 644 (1968).

  4. Bernstein, L., J. W. Brown, and H. E. Hayward: The influence of rootstock on growth and salt accumulation in stone-fruit trees and almonds. Proc. Amer. Soc. Hort. Sci. 68, 86–95 (1956).

  5. —, and H. E. Hayward: Physiology of salt tolerance. Ann. Rev. Plant Physiol. 9, 25–46 (1958).

  6. Canny, M. J., and M. J. Askham: Physiological inferences from the evidence of translocation of a tracer: a caution. Ann. Bot., N.S. 31, 409–416 (1967).

  7. Clarkson, D. T., and J. Sanderson: In preparation.

  8. Crossett, R. N.: Autoradiography of 32P in maize roots. Nature (Lond.) 213, 312–313 (1967).

  9. Gaugh, H. G., and C. H. Wadleigh: The effects of high concentrations of sodium, calcium, chloride and sulphate on ionic absorption by bean plants. Soil Sci. 59, 139–153 (1954).

  10. Huffaker, R. C., and A. Wallace: Sodium absorption by different plant species at different potassium levels. Soil Sci. 87, 130–134 (1959).

  11. Jacoby, B.: Sodium retention in excised bean stems. Physiologia Pl. 18, 730–739 (1965).

  12. Jennings, D. H.: Halophytes, succulence and sodium in plants — a unified theory. New Phytol. 67, 899–911 (1968).

  13. Pearson, G. A.: Absorption and translocation of sodium in beans and cotton. Plant Physiol. 42, 1171–1175 (1967).

  14. Pitman, M. G., A. C. Courtice, and B. Lee: Comparison of potassium and sodium uptake by barley roots at high and low salt status. Aust. J. biol. Sci. 21, 871–881 (1968).

  15. —, and H. W. Saddler: Active sodium and potassium transport in cells of barley roots. Proc. nat. Acad. Sci. (Wash.) 57, 44–52 (1967).

  16. Rogers, A. W.: Techniques of autoradiography. Amsterdam: Elsevier 1967.

  17. Wallace, A.: The effect of temperature and pH on sodium translocation and sodium exchange reactions in bush beans. Soil Sci. 106, 144–148 (1968).

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Shone, M.G.T., Clarkson, D.T. & Sanderson, J. The absorption and translocation of sodium by maize seedlings. Planta 86, 301–314 (1969). https://doi.org/10.1007/BF00388956

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Keywords

  • Sodium
  • Potassium
  • Maize
  • Small Region
  • Basal Part