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Abstract: The carbon and amino acid metabolism of Cantharellus cibarius was studied using NMR analyses of a cultivated mycelium and its exudates. 'H-NMR showed exudation of significant amounts of carbohydrates and organic acids to the growth medium. 13C-NMR indicated that C cibarius is able to rapidly synthesize mannitol during glucose assimilation. Carbon from mannitol is then used to form trehalose and free amino acids, such as arginine. Mannitol and trehalose were also exudated to surrounding medium. Fluorescent Pseudomonas bacteria isolated from fruit bodies of C. cibarius, the surrounding soil and soil devoid of fruit bodies were able to utilize trehalose and mannitol regardless of their original biotope. The ability to use such exudates may explain why fruit bodies of C. cibarius remain undamaged in spite of high numbers of growing fluorescent Pseudomonas.
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