The increased production of ethylene that occurs during the development of sporocarps of results from increased formation by the compost but not by the casing layer. The increase depends on the presence of sporocarps up to a critical point in their development. It is concluded that the mycelium of in the compost is responsible for this ethylene production because no significant bacterial flora was found in the compost from fruiting cultures, and the mycelium growing on complex agar media also liberated ethylene. Mycelium growing on defined synthetic medium also evolved ethylene if methionine was supplied.

From the results of the different assays, there was no evidence for a regulatory role of ethylene in growth or development of


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