Summary: A concentration of 5% carbon dioxide in air prevents fruiting in and at the same time prevents the breakdown of R-glucan [(1 → 3)-β,(1 → 6)-β-glucan] in the wall which normally occurs during growth of the pilei. R-glucanase is produced as in cultures grown in air but cultures grown in CO-enriched air form more of a water-soluble (1 → 3)-β,(1 → 6)-β-glucan (mucilage) and less R-glucan. This R-glucan is more resistant to enzymic hydrolysis which may explain the decreased breakdown of R-glucan . Since R-glucan degradation is required for growth of the pilei to occur, CO must indirectly inhibit growth of the pilei by changing the composition of the walls in the previously formed mycelium.


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