The Influence of Carbon Dioxide on Sporulation and Citric Acid Synthesis in Dark-Grown Penicillium Isariiforme

In blue light Penicillium isariiforme assimilates less COz 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 COz assimilation in this fungus. Of the glycolytic intermediates assayed, steady-state concentrations of pyruvate were low and concentrations of glucose 6-phosphate, glucose I-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-MeyerhofParnas pathway.

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Metabolism in Penicillium isariiforme on Exposure to Light, with Special Reference to Citric Acid Synthesis

Graafmans¹

1974

Journal of General Microbiology

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The Influence of Carbon Dioxide on Sporulation and Citric Acid Synthesis in Dark-Grown Penicillium Isariiforme

Abstract: In higher carbon dioxide concentrations sporulation in dark-grown Penicillium isariiforme is inhibited, whereas citric acid production is increased.

Cited by 7 publications

References 10 publications

Effect of carbon dioxide on yeast growth and fermentation

Effect of carbon dioxide on yeast growth and fermentation

Effect of Blue Light on Metabolism in Penicillium isariiforme

Metabolism in Penicillium isariiforme on Exposure to Light, with Special Reference to Citric Acid Synthesis

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