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Plant Physiology 49:572-578 (1972)
© 1972 American Society of Plant Biologists

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Articles

Anaerobic Accumulation of {gamma}-Aminobutyric Acid and Alanine in Radish Leaves (Raphanus sativus, L.)

John G. Streeter1 and John F. Thompson

a United States Plant, Soil, and Nutrition Laboratory, Soil and Water Conservation Research Division, Agricultural Research Service, United States Department of Agriculture, and Section of Genetics, Development, and Physiology, Division of Biological Sciences, Cornell University, Ithaca, New York 14850

In leaves, the anaerobic accumulation of alanine was accompanied by a loss of aspartate, and these changes preceded {gamma}-aminobutyrate accumulation and glutamate loss. Changes in keto acid content did not appear to be the cause of amino acid changes. Accumulation of {gamma}-aminobutyrate was due to acceleration of glutamate decarboxylation and arrest of {gamma}-aminobutyrate transamination. Changes in enzyme content did not explain the changes in reaction rates in vivo. Most of the aspartate may be converted anaerobically to alanine via oxalacetate and pyruvate.

1 Recipient of a National Science Foundation Graduate Fellowship. Present address: Department of Agronomy, Ohio Agricultural Research and Development Center, Wooster, Ohio 44691.




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