Solubilization of rock phosphate by rape (original) (raw)

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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Authors and Affiliations

1. Department of Soil Science and Plant Nutrition, Wageningen Agricultural University, P.O. Box 8005, 6700 EC, Wageningen, The Netherlands
   Ellis Hoffland, Günter R. Findenegg & Jacob A. Nelemans

Authors

1. Ellis Hoffland
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2. Günter R. Findenegg
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3. Jacob A. Nelemans
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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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• Received: 26 April 1988
• Revised: 15 September 1988
• Issue Date: January 1989
• DOI: https://doi.org/10.1007/BF02280176

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