In Vivo and In Vitro Studies on gamma-Aminobutyric Acid Metabolism with the Radish Plant (Raphanus sativus, L.) |
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| Authors: | Streeter J G Thompson J F |
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| Affiliation: | 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. |
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| Abstract: | Labeled glutamate was rapidly converted to γ-aminobutyrate in intact, excised radish (Raphanus sativus L., var. Champion) leaves. Labeled γ-aminobutyrate was metabolized via succinate and the Krebs cycle and was not carboxylated to form glutamate. Administration of carbon-14 and tritium-labeled succinate indicated that less than 10% of the γ-aminobutyrate formation occurs by amination of succinic semialdehyde. Therefore, most γ-aminobutyrate formation must be via glutamate decarboxylation. |
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