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Plant Physiology 85:315-317 (1987)
© 1987 American Society of Plant Biologists

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Environmental and Stress Physiology

Citrate, Malate, and Succinate Concentration in Exudates from P-Sufficient and P-Stressed Medicago sativa L. Seedlings 1

Doug S. Lipton2, Robert W. Blanchar and Dale G. Blevins

Department of Agronomy, University of Missouri, Columbia, Missouri 65211

Under certain stress conditions roots exude organic molecules, which may facilitate the uptake of nutrients. The objective of this research was to identify and measure the effect of low P upon the exudation of organic acids by roots of alfalfa (Medicago sativa L.) seedlings. Surface-sterilized alfalfa seeds were grown aseptically in sterile sand using an apparatus specially designed for the addition of ±P nutrient solutions and for the collection of root exudates. Citric, malic, and succinic acids were detected in the root exudates of 24-day-old alfalfa seedlings. Citrate exudation from the roots of P-stressed alfalfa was 182% that of plants receiving a complete nutrient solution. The increased release of citrate may provide a mechanism by which P-stressed plants enhance the availability of P in the rhizosphere.

2 Research Assistant, University of California at Berkeley.

1 Contribution from the Missouri Agricultural Experiment Station, Columbia, MO 65211. Journal Series No. 9790 approved by the director.




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