Some further studies on metabolism of acetate-l-14C in potassium deficient rice leaves |
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Authors: | YAMASHITA TADAAKI; FUJIWARA AKIO |
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Institution: | Faculty of Agriculture, Tohoku University Sendai |
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Abstract: | Acetate-1-14C was fed to excised leaves of normal and potassiumdeficient rice plants. The rate of respiratory evolution of14CO2 was increased by a potassium deficiency. Malonate, glyoxylateor malate supplied enhanced the metabolism of acetate-l-14C.These results suggest an accelerated turn of the TCA cycle inpotassium deficient leaves. Malate synthetase activity was notrecognized in either normal or deficient leaves. However, condensingenzyme activity was higher in deficient leaves than in normalones. An addition of DNP to the leaves increased 14CO2 productionfrom acetate-l-14C though its effect was smaller in deficientleaves than it was in normal ones. This result may suggest anincrease in the turnover rate of ATP or loose coupling of electrontransfer with oxidative phosphorylation in deficient leaves.Chromatographic separation of cold acidsoluble nucleotides hasshown that the ATP level was lowered by a potassium deficiency,though the ADP level was not affected.
1Present address: Sericultural Experiment Station, Suginami-Ku,Tokyo |
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