Abstract
The composition and quantity of low-molecular weight organic acids exudated by the roots of four different plant species (Brassica napus L., Lycopersicum esculentum L., Medicago sativa L., Zea mays L.) and two different tomato cultivars (Lycopersicum esculentum L, cv. ‘Freude’, ‘Marmande’) under deficient and sufficient phosphorus supply were assessed by HPLC. Organic acid exudation of the different plant species was influenced by both phosphorus supply and plant species respectively. L. esculentum and M. sativa exudated more organic acids under phosphorus deficient conditions. B. napus and Z. mays did not show this response and therefore might follow a different strategy in order to enhance phosphorus uptake. Under phosphorus deficiency, citrate and succinate exudation were enhanced in the tomato cultivar ‘Freude’ but the cultivar ‘Marmande’ showed no such response. Organic acid exudation decreased with increasing shoot dry weight in the cultivar ‘Freude’. We conclude from our studies that the exudation of organic acids in response to phosphorus supply is both species and cultivar dependent.
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