Abstract
Laetiporus sulphureus is an edible wood-rotting basidiomycete fungus whose fruiting bodies contain substances with verified therapeutic evidences and large amounts of α-(1 → 3)-glucan which is used as an effective inducer of microbial α-(1 → 3)-glucanases. However, production of mature fruiting bodies of this species under artificially controlled conditions has not been reported until now. Here, we provide the first report of successful initiation and development of L. sulphureus fruiting bodies in large-scale experiments. Twelve Laetiporus strains were isolated from a natural habitat. A synthetic log production system with a substrate composed of a mixture of sawdust enriched with organic and inorganic additives was developed. It was found that shocking the fungus mycelium with cold water or low temperature was the only suitable method for forced fruiting of L. sulphureus strains. Primordia of two strains were initiated already after 5–6 days from induction, and after another 2 days, they began to develop into fruiting bodies. Carpophores appeared fastest on substrates with high organic supplementation (40–45 %) and a low moisture content (40 %). The resulting mature fruiting bodies reached a weight of 200–300 g. The method of cultivation presented in this paper opens the way to commercial production of this valuable basidiomycete.
Highlights
Laetiporus sulphureus (Bull.: Fr.) Murrill belonging to Basidiomycotina, Aphyllophorales, Polyporaceae is a parasitic and saprobic fungus growing alone or more typically in large clusters on decaying logs, stumps and trunks of many deciduous and coniferous tree species
Molecular analysis of the internal transcribed region (ITS) region of the isolated strains clearly identified them as belonging to the genus L. sulphureus
It should be mentioned that, in natural conditions, fruiting bodies of L. sulphureus develop on dying trees, mainly during late spring and early summer (Guminska and Wojewoda 1985) when there is active transfer of water and nutrients between the root zone and tree crowns
Summary
Laetiporus sulphureus (Bull.: Fr.) Murrill belonging to Basidiomycotina, Aphyllophorales, Polyporaceae is a parasitic and saprobic fungus growing alone or more typically in large clusters on decaying logs, stumps and trunks of many deciduous and coniferous tree species. It was found that shocking the fungus mycelium with cold water or low temperature was the only suitable method for forced fruiting of L. sulphureus strains. This paper is the first report of successful pilot-scale production of mature fruiting bodies of L. sulphureus on an artificial sawdust substrate.
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