Plant and Soil

, Volume 113, Issue 2, pp 161–165

Solubilization of rock phosphate by rape

II. Local root exudation of organic acids as a response to P-starvation
  • Ellis Hoffland
  • Günter R. Findenegg
  • Jacob A. Nelemans
Article

DOI: 10.1007/BF02280176

Cite this article as:
Hoffland, E., Findenegg, G.R. & Nelemans, J.A. Plant Soil (1989) 113: 161. doi:10.1007/BF02280176

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.

Key words

agar plate technique Brassica napus citric acid malic acid phosphate nutrition rhizosphere acidification 

Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Ellis Hoffland
    • 1
  • Günter R. Findenegg
    • 1
  • Jacob A. Nelemans
    • 1
  1. 1.Department of Soil Science and Plant NutritionWageningen Agricultural UniversityWageningenThe Netherlands

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