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The occurrence and properties of enzymes of carbohydrate metabolism were studied during dikaryotic fruiting of the mushroomCoprinus lagopus . Enzymes of hexose monophosphate catabolism, sugar alcohol (polyol) dehydrogenases (DH), and trehalase occurred throughout development. The ratio of xylitol DH to sorbitol DH was greater than unity in both monokaryotic mycelium and dikaryotic fruit body caps, whereas this ratio decreased in the stipe (stalk) tissue. Xylitol DH and sorbitol DH were both dependent upon nicotinamide adenine dinucleotide (NAD) and showed maximal activity atp H 9. Two separate enzymes were suspected on the basis of preferential utilization of the NAD analogue, thionicotinamide-NAD, by xylitol DH, and this feature was consistent throughout development. An appraisal of the carbohydrate pool revealed trehalose and glucose, with the former predominant in the stipe and the latter in excess in the cap of dikaryotic fruit bodies. Trehalase activity in dialyzed enzyme extracts showedp H optima at acid and alkalinep H levels in monokaryotic mycelium, dikaryotic stipes, and cap tissues.

Carbohydrate Metabolism During Morphogenesis of Coprinus lagopus ( sensu Buller)