SUMMARY: Carbon dioxide at a concentration of 1 to 2% (v/v) in air enhanced the growth rate and inhibited sclerotium formation in the fungus Sacc. A CO concentration of 10% inhibited growth. Similar growth patterns were observed when the fungus was grown on a medium supplemented with the fungicide carboxin, which inhibits succinate dehydrogenase. A high CO concentration (1 to 10%) or growth on carboxin-supplemented medium caused a decrease in succinate dehydrogenase activity and significant increases in isocitrate lyase, isocitrate dehydrogenase, malate synthase and malate dehydrogenase activities. Mycelium of grown at a high CO concentration contained less glyoxylate, lipids and glycogen than mycelium grown in air. It is suggested that sclerotium formation in requires a balanced supply of carbohydrate intermediates and energy.


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