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Plant and Soil

, Volume 70, Issue 1, pp 107–124 | Cite as

The acquisition of phosphorus byLupinus albus L.

III. The probable mechanism by which phosphorus movement in the soil/root interface is enhanced
  • W. K. Gardner
  • D. A. Barber
  • D. G. Parbery
Article

Summary

Large quantities of citrate ions have been shown to be secreted by the roots ofLupinus albus. It is postulated that these react in the soil to form ferric hydroxy phosphate polymers which diffuse to the root surface where they are degraded by the action of reducing agents in the presence of an Fe II uptake mechanism balanced by hydrogen ion secretion. Some known chemical behaviour of Fe III and citrate which supports this postulate is reviewed. Evidence is also presented which suggests that much of the Fe absorbed circulates within the root system and is subsequently precipitated.

Key words

Citrate Iron Lupins Lupinus albus L. Phosphorus Polymers 

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Copyright information

© Martinus Nijhoff/Dr W. Junk Publishers 1983

Authors and Affiliations

  • W. K. Gardner
    • 1
  • D. A. Barber
    • 2
  • D. G. Parbery
    • 3
  1. 1.School of Agriculture and ForestryUniversity of MelbourneParkvilleAustralia
  2. 2.Department of AgricultureVictorian Crops Research InstituteHorshamAustralia
  3. 3.School of Agriculture and ForestryUniversity of MelbourneParkvilleAustralia

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