Interaction between the mycoparasite Verticillium fungicola and the vegetative mycelial phase of Agaricus bisporus

Host-parasite interactions of Agaricus bisporus and Verticillium fungicola were studied in paired-cultures. Different growth reactions were found acco rding to the culture medium used, but no apparent alterations could be dete cted by light and electron microscopy in A. bisporus vegetative mycelia. In vitro, different hydrolytic enzymes are produced by V. fungicola in cultur es with A. bisporus vegetative mycelial cell walls as the only carbon sourc e. In vitro, this enzyme preparation is able to partially digest isolated A . bisporus vegetative mycelial cell walls. These results suggest that altho ugh apparent attachment of the mycoparasite to the host cell surface seems to occur, there is no in vivo A. bisporus vegetative mycelial cell wall deg radation.