Summary
Experiments were conducted to determine the quantity of organic acids in root exudates, if any, released by sugar beet plants and to measure P solubility after addition of organic acids to soil.
In a first experiment, sugar beet plants were grown in quartzsand at different levels of P application. After 20 days, root exudates were collected by transfering plants of different P status to 2 mM CaCl2 solution for 16 hours. Organic acids were estimated in root exudates by HPLC. Roots of sugar beet plants grown at different P levels released oxalic acid, oxalacetic acid and citric acid generally in the ratio of 1 : 0,35 : 0,15. The amount of carboxylates exuded by P deficient plants (less than 0,1 % P of shoot-dm) were significantly higher as compared to P sufficient plants. Maximum amount of 23 nmol ٭ m root length-1 ٭ h-1 of oxalic acid was released by P deficient plants.
In another experiment, different amounts of mixture of oxalic acid, oxalacetic acid and citric acid (in the ratio of 1 0,35 0,15) were used to extract P from soil (Fluvisol — of medium P status) by shaking 20 g soil and 50 ml mixture for 16 hours. Increasing amounts of mixture of organic acid progressively increased the amount of P released from soil and decreased the pH. It has also been shown that main P fraction mobilized by organic acids was that bound to surfaces of Fe/Al-oxides via ligand exchange. The increase in P solubility by a decrease of pH (due to higher solubility of Ca-phosphate) was not much in the present soil.
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© 1996 B. G. Teubner Verlagsgesellschaft Leipzig
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Beißner, L., Römer, W. (1996). Ausscheidung von Organischen Säuren durch die Zucker-Rübenwurzel und Deren Bedeutung für die P-Mobilisierung im Boden. In: Merbach, W. (eds) Pflanzliche Stoffaufnahme und mikrobielle Wechselwirkungen in der Rhizosphäre. Vieweg+Teubner Verlag. https://doi.org/10.1007/978-3-322-81041-0_16
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DOI: https://doi.org/10.1007/978-3-322-81041-0_16
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