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

SUMMARY: When exposed to light, cultures of Penicillium isariiforme showed a sharp decrease in citric acid accumulation in the medium compared with parallel cultures in continuous darkness, and a rise in the production of other low molecular weight intracellular intermediates, lipids, nucleic acids and protein. The significance of these phenomena is discussed.