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Metabolism and Enzymology

Induction of Pyrophosphate:Fructose 6-Phosphate 1-Phosphotransferase by Anoxia in Rice Seedlings ¹

Laboratoire de Chimie Physiologique, Université Catholique de Louvain, Avenue Hippocrate 75, B-1200 Brussels, Belgium, International Institute of Cellular and Molecular Pathology, UCL 75.39, Avenue Hippocrate 75, B-1200 Brussels, Belgium

Rice (Oryza sativa) seeds were imbibed for 3 days and the seedlings were further incubated for 8 days in the presence of either air or nitrogen. In aerobiosis, the specific activity of pyrophosphate:fructose 6-phosphate 1-phosphotransferase and that of the ATP-dependent phosphofructokinase increased about fourfold. In anaerobiosis, the specific activity of ATP-dependent phosphofructokinase remained stable, whereas that of pyrophosphate:fructose 6-phosphate 1-phosphotransferase increased as much as in the presence of oxygen and there was also a fourfold increase in the concentration of fructose 2,6-bisphosphate, a potent stimulator of that enzyme. These data suggest a preferential involvement of pyrophosphate:fructose 6-phosphate 1-phosphotransferase rather than of ATP-dependent phosphofructokinase in glycolysis during anaerobiosis.

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