Solubilization of rock phosphate by rape: II. Local root exudation of organic acids as a response to P-starvation

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 nutr...

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Bibliographic Details
Published in:Plant and soil 1989-01, Vol.113 (2), p.161-165
Main Authors: HOFFLAND, ELLIS, FINDENEGG, GÜNTER R., NELEMANS, JACOB A.
Format: Article
Language:English
Subjects:
Acidification
Citrates
Exudation
Nutrient solutions
Organic acids
Phosphates
Plant roots
Plants
Rhizosphere
Root tips
Sectie Bodemkwaliteit
Sub-department of Soil Quality
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Summary: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 indicated 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.
ISSN:0032-079X
1573-5036
DOI:10.1007/BF02280176