Abstract
During 195-min light exposure following 5 d in dark, nitrate content was studied in different organs of lucerne plants in early bud stage. Nitrate content varied considerably especially in stems. Rapid diurnal variations in nitrate content were found in lower and upper halves of stems, in petioles and in leaf blades. The results reflected discontinuous nitrate movement in lucerne shoots. The positive correlation between the diurnal course of the nitrate and potassium contents in different plant organs showed that the K+ transport followed the NO3 − transport. Similar diurnal changes were found also in Na+ and Ca2+ contents. Discontinuous salt movements occurring in xylem sap flow were in contrary to continuous transpiration stream and could be a consequence of temporary adsorption or binding of salts in xylem vessels.
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Rerefences
Ben Zioni, A., Vaadia, Y., Lips, S.H.: Nitrate uptake by roots as regulated by nitrate products of the shoots. — Physiol. Plant.24: 288–290, 1971.
Bell, C.W., Biddulph, O.: Translocation of calcium. Exchange versus mass flow. — Plant Physiol.38: 610–614, 1963.
Eskew, D.L., Schrader, L.E., Bingham, E.T.: Seasonal patterns of nitrate reductase activity and nitrate concentration of two alfalfa(Medicago saliva L.) cultivars. — Crop Sci.13: 594–597, 1973.
Hall, S.M., Baker, D.A.: The chemical composition ofRicinus phloem exudate. — Planta106: 131–140, 1972.
Isermann, K.: Der Einfluss von Absorptionsvorgänge im Xylem auf die Calcium-Verteilung in der höheren Pflanzen. — Z. Pflanzenernähr. Bodenk.126: 191–203, 1970.
Lee, C.T., Smith, D.: Changes in the concentrations of nitrogenous fractions in alfalfa herbage with advance in maturity. — Agron. J.64: 326–327, 1972.
Pate, J.S.: Uptake, assimilation and transport of nitrogen compounds by plants. — Soil Biol. Biochem.5: 109–119, 1973.
Plhák, F.: Changes in total nonstructural saccharides content of alfalfa plants during light and dark periods. — Photosynthetica15: 122–128, 1981.
Plhák, F.: Diurnal variations of photosynthates, proteins and mineral substances in alfalfa leaves. — Photosynthetica18: 338–343, 1984.
Plhák, F.: Diurnal variations of potassium content in lucerne plants. — Biol. Plant.29: 221–229, 1987.
Plhák, F.: Relation between potassium content and vascular bundles volume in overground organs of lucerne. — Acta Univ. Carolinae — Biol.31: 85–89, 1988.
Plhák, F.: Nitrate movement in xylem of lucerne plants. — Biol.Plant.34: 109–113, 1992.
Shawney, S.K., Naik, M.S.: Role of light in the synthesis of nitrate reductase and nitrite reductase in rice seedlings. — J. Biochem.130: 475–485, 1972.
Smith, D., Sund, J.M.: Influence of stage of growth and soil nitrogen on nitrate content of herbage of alfalfa, red clover, trefoil, and bromegrass. — J. agr. Food Chem.13: 81–84, 1965.
Šenkýř, J., Petr, J.: [Nitrate ion selective electrode.] — Chem.Listy (Praha)73: 1097, 1979. [In Czech.]
Vance, C.P., Heichel, G.H.: Nitrate assimilation during vegetative regrowth of alfalfa. — Plant Physiol.68: 1052–1056, 1981.
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Plhák, F. Comparison of diurnal changes in nitrate and potassium contents in lucerne shoots. Biol Plant 34, 101–107 (1992). https://doi.org/10.1007/BF02925799
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DOI: https://doi.org/10.1007/BF02925799