Summary: In blue light assimilates less CO and excretes less citric acid into the medium than when grown in continuous darkness. This is due to a decreased supply of pyruvate which is carboxylated to form citric acid via oxaloacetate. Pyruvate carboxylase rather than phosphoenolpyruvate carboxylase or phosphoenolpyruvate carboxykinase is mainly responsible for CO assimilation in this fungus. Of the glycolytic intermediates assayed, steady-state concentrations of pyruvate were low and concentrations of glucose 6-phosphate, glucose 1-phosphate and fructose 6-phosphate were high in mycelium grown in the light compared with those in mycelium grown in the dark. Results of experiments with specifically-labelled glucose suggest that light stimulates the pentose phosphate pathway and inhibits the supply of pyruvate for citric acid synthesis via the Embden–Meyerhof–Parnas pathway.


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