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Fruiting of Agaricus bisporus

Changes in extracellular enzyme activities during growth and fruiting

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Several enzymes were assayed in extracts from mycelium-colonised compost during growth and fruiting of Agaricus bisporus (Lange) Imbach. Comparison of changes of enzyme levels in axenic and nonaxenic cultures and in cultures of non-fruiting strains indicated that they were associated directly with the fungal mycelium. Large changes were found in the amounts of laccase and cellulase which were correlated with fruit body development. Laccase concentration increased during mycelial growth and then declined rapidly at the start of fruiting. Cellulase activity could be detected throughout growth but increased at fruiting. No such changes were observed in xylanase, alkaline protease, laminarinase and acid and alkaline phosphatases. Activities of laccase and cellulase were measured in axenic cultures arrested at various stages of fruiting development. Such cultures showed that the changes in concentration of laccase and cellulase were associated with the enlargement of fruit bodies.

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Wood, D.A., Goodenough, P.W. Fruiting of Agaricus bisporus . Arch. Microbiol. 114, 161–165 (1977).

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