Volume 12 Part 2 Article 37: Role of First-Generation Bacteria in the Superiority of Compact Timber Substrates to Wood Dust in Supporting Optimum Yield Figures of Wood-Decay Mushrooms

Volume 12 Part 2 Article 37
Year 1989
Title: Role of First-Generation Bacteria in the Superiority of Compact Timber Substrates to Wood Dust in Supporting Optimum Yield Figures of Wood-Decay Mushrooms
Author: G. Gramss

Abstract:

The world production figures of the mushroom species now commercially grown cannot solely be taken for a certificate of absolute quality and popularity. To a great extent these figures also reflect the progress made in adapting the growth technology of the fungus in quest to the needs of the industrialized mushroom farm.

Within the group of wood-decay mushrooms the partial preference to compact timber substrates as well as the contemporary rejection of replacement substrates like wood dust and lignocellulose wastes is one of the reasons to prevent the large-scale production of top-quality fungi such as Kuehneromyces mutabilis on an industrial level (Table 1) . When a fungal mycelium intends to colonize a nonstenle substrate it must afford a minimum of competitive saprophytic ability (kratovirulence, Gramss 1985) to repress, or completely eliminate, its antagonistic and predominantly competitive microbial by-population (Gramss, 1987). From this point of view the colonization of compact timber taken from the internally near-sterile trunk of a freshly felled host tree is a nondramatic contest between the cultivated fungal mycelium and the first generation of Gram-negative bacteria which are nearly the sole occupants of spawned timber sections within 2 to 6 weeks after felling (Gramss, in press). Converting this freshly felled timber to sawdust, however, means not only the introduction of countless accidental microbial contaminants but also the rapid build-up of storage fungi predominantly untypical of compact timber (Shields, 1969; Tansey, 1971; Smith and Ofosu-Asiedu, 1972).

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