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.
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Gardner, W.K., Barber, D.A. & Parbery, D.G. The acquisition of phosphorus byLupinus albus L.. Plant Soil 70, 107–124 (1983). https://doi.org/10.1007/BF02374754
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DOI: https://doi.org/10.1007/BF02374754