Some further studies on metabolism of acetate-1-^<14>C in potassium deficient rice leaves

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Acetate-1-^<14>C was fed to excised leaves of normal and potassium deficient rice plants. The rate of respiratory evolution of ^<14>CO_2 Was increased by a potassium deficiency. Malonate, glyoxylate or malate Supplied enhanced the metabolism of acetate-1-^<14>C. These results suggest an accelerated turn of the TCA cycle in potassium deficient leaves. Malate synthetase activity was not recognized in either normal or deficient leaves. However, condensing enzyme activity was higher in deficient leaves than in normal ones. An addition of DNP to the leaves increased ^<14>CO_2 production from acetate-1-^<14>C though its effect was smaller in deficient leaves than it was in normal ones. This result may suggest an increase in the turnover rate of ATP or loose coupling of electron transfer with oxidative phosphorylation in deficient leaves. Chromatographic separation of cold acid-soluble nucleotides has shown that the ATP level was lowered by a potassium deficiency, though the ADP level was not affected.
日本植物生理学会の論文