Abstract
Wood residues from forestry industries can be potential raw materials for specialty and edible mushroom production. The aim of this study was to evaluate the suitability of wood residues for the cultivation of Ganoderma lucidum originating from boreal forests. The substrates tested included sawdust and wood chips of Betula spp., Populus tremula, Picea abies, Pinus sylvestris and Larix sp. The suitability of the substrates and the ability of the strains to develop fruiting bodies and produce β-glucan were evaluated. Fruiting body formation was supported by applying two different cold shock treatments to substrate bags. The highest yields were observed with MUS192 strain and Betula spp. and P. tremula wood-based substrates. β-Glucan content in the fruiting bodies was highest with the MUS75 and P. tremula wood-based substrate. Based on these findings, the combination of P. tremula wood residues and the MUS192 strain is proposed to enhance the yield and β-glucan content of the fruiting bodies. A cold treatment of 5 °C is suggested to induce primordia formation and to increase fruiting probability. This is the first time that strains of G. lucidum originating from boreal forests have been compared and successfully cultivated simulating commercial indoor cultivation.
Highlights
High volumes of wood-based side streams are generated from wood processing industries in Europe
The suitability of strains (MUS192, MUS6, MUS75, MUS9, MUS12 and MUS19), wood substrates (Betula spp., P. tremula, P. abies, P. sylvestris and Larix sp.) and cold treatments (5 ◦ C and −20 ◦ C) for the cultivation of G. lucidum were evaluated by their capability of producing fruiting bodies
The strain of strain, wood substrate and cold treatment on the successful fruiting, yield and β-glucan content of the fruiting bodies of G. lucidum was studied in this work
Summary
High volumes of wood-based side streams are generated from wood processing industries in Europe. In Finland, sawmill and plywood industries alone produced in 2016 over 1.2 million cubic meters of side streams [1]. One of the threats associated with the utilization of wood-based side streams is the scarce development of new products and the expensiveness of the process [2]. Wood-based side streams, mainly composed of wood chips, sawdust and bark, are mostly used for energy and pulp production in Northern Europe [2]. The main tree species grown and used in sawmill and plywood industries in Finland are conifer species (Pinus sylvestris and Picea abies) and birch (Betula pendula and Betula pubescens) [1]. Other species available [3] are used on a minor scale such as Populus tremula and
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