The Effect of High Oxygen Pressure on the Respiratory Metabolism of Pea Seeds

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Abstract
The time course of the changes in concentration of certain of the intermediates of the Krebs cycle (and derivatives of these intermediates) in the mature pea seed during the inhibition of respiration by high oxygen pressure has been studied. The results support the conclusion that the primary effect of high oxygen pressure is an inhibition of the oxidation of citric acid by the Krebs cycle. Aconitase appears to be the most likely site of inhibition. In the later stages of treatment there appears to be a slowing of the rate of glycolysis either as a consequence of the primary inhibition or due to direct inhibition of other enzymes. The highest rate of citrate accumulation observed in this work would allow 50 per cent. of the aerobic carbon dioxide output of the pea seed to be derived from the Krebs cycle.

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