Abstract
Local rhizosphere acidification by rape as a reaction to P-starvation was visualized by means of an agar plate technique. By means of a modification of this technique local differences in cation-anion uptake and organic acid exudation along intact roots of rape were observed for plants grown on nutrient solution with or without added P. No differences in uptake rates of K-, NO3- and Ca-ions could be detected between P-starved and P-supplied plants. However, exudation of malic and citric acid was distinctly higher in acidified root zones of P-starved plants, coinciding with higher levels of malate in the corresponding root tissue. Organic acid exudation is indicates as the cause of local rhizosphere acidification by rape as a reaction to P-starvation and as a possible mechanism of its phosphate-solubilizing capacity.
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References
Anonymous 1984 methods of Enzymatic Food Analysis Using Single Reagents. Boehringer Mannheim GmbH. Mannheim. F.R. Germany.
Bekele T, Cino B J, Ehlert P A J, Van der Maas A A and Van Diest A 1983 An evaluation of plant-borne factors promoting the solubilization of alkaline rock phosphates. Plant and Soil 75, 361–378.
De Vos C R, Lubberding H J and Bienfait H F 1986 Rhizosphere acidification as a response to iron deficiency in bean plants. Plant Physiol. 81, 842–846.
Gardner W K, Barber D A and Parbery D G 1983 The acquisition of phosphorus byLupinus albus L. III. The probable mechanism by which phosphorus movement in the soil/root interface is enhanced. Plant and Soil 70, 107–124.
Hedley M J, Nye P H and White R E 1982 Plant-induced changes in the rhizosphere of rape (Brassica napus cv. Emerald) sedlings. II. Origin of the pH change. New Phytol. 91, 31–44.
Hedley M J, Nye P H and White R E 1983.Plant-induced changes in the rhizosphere of rape (Brassica napus cv. Emerald) seedlings. IV. The effect of rhizosphere phosphorus status on the pH, phosphatase activity and depletion of soil phosphorus fractions in the rhizosphere and on the cationanion balance in plants. New Phytol. 95, 69–82.
Hoffland E, Findenegg G R and Nelemans J A 1989 Solubilization of rock phosphate by rape. I. Evaluation of the role of the nutrient uptake pattern. Plant and Soil 113, pages 00.
Laheurte F and Berthelin J 1988 Effect of a phosphate solubilizing bacteria on maize growth and root exudation over four levels of labile phosphorus. Plant and Soil 105, 11–17.
Landsberg E-Ch 1981 Organic acid synthesis and release of hydrogen ions in response to Fe deficiency stress of mono-and dicotyledonous plant species. J. Plant Nutr. 3, 579–591.
Lipton G S, Blanchar R W and Blevins D G 1987 Citrate, malate and succinate concentration in exudates from P-sufficient and P-stressedMedicago sativa L. seedlings. Plant Physiol. 85, 315–317.
Marschner H, Römheld V, Horst W J and Martin P 1986 Root-induced changes in the rhizosphere: Importance for the mineral nutrition of plants. Z. Pflanzenernaehr. Bodenkd. 149, 441–456.
Moorby H, White R E and Nye P H 1988 The influence of phosphate nutrition on H ion efflux from the roots of young rape plants. Plant and Soil 105, 247–256.
Ratnayake M, Leonard R T and Menge J A 1978 Root exudation in relation to supply of phosphorus and its possible relevance to mycorrhizal formation. New Phytol. 81, 543–552.
Van Egmond F and Aktas M 1977 Iron-nutritional aspects of the ionic balance of plants. Plant and Soil 48, 685–703.
Weisenseel M H, Dorn A and Jaffe L F 1979 Natural H+ currents traverse growing roots and root hairs of barley (Hordeum vulgare L.). Plant Physiol. 64, 512–518.
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Hoffland, E., Findenegg, G.R. & Nelemans, J.A. Solubilization of rock phosphate by rape. Plant Soil 113, 161–165 (1989). https://doi.org/10.1007/BF02280176
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DOI: https://doi.org/10.1007/BF02280176