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Abstract: In some early investigations, unidentified volatile metabolites were shown to affect the initiation of mushroom sporophores (Mader, 1943, Schisler, 1957). Tschierpe (1959) attributed such effect to the levels of carbon dioxide. When cultures of Agaricus bisporus were supplied with carbon dioxide-free air, there was a reduction both in growth and yield of the mushroom (Flegg, 1952). More recent studies indicate an optimum carbon dioxide concentration for fruitbody initiation of several mushroom strains in the range of 300-1000 ppm (Tschierpe and Sinden, 1964). The vegetative hyphae of the mushroom gave markedly different responses to carbon dioxide when they were grown in sterilized casing as compared with unstenhzed. This corroborates the importance of both carbon dioxide and the casing microflora in controlling mushroom fruitbody initiation (Long and Jacobs, 1968). Aseptic fruiting of the cultivated mushroom took place over a restricted range of carbon dioxide from 100 to 1000 ppm (Long and Jacobs, 1974). Mycelial strands have been shown to fix more radioactive carbon dioxide than unstranded mycelium (Le Roux and Couvy, 1972). However, there has been little attention to carbon dioxide fixation during the development of the mushroom fruitbodies This experiment was designed to provide some additional information on carbon dioxide fixation by the cultivated mushroom, Agaricus bisporus.
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