The intent of this work was to study the biological and biochemical aspects of the casing soil role on every stage of the A. bisporus fructification. We reported the development of mycelial thick threads of A. bisporus in the casing soil. Moreover, we pointed out the protective role of the calcium salts crystals surrounding the hyphae during the incubation stage. On the electron‐micrographies, the mycelial aggregates were surrounded by bacteria, and this bacterial growth seemed to be related to the calcium salts crystals disappearance. The positive influence of A. bisporus upon bacterial growth, and vice versal, was confirmed with PETRI dish cultures.
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Cochet et al. (1992) studied this question.
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