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I found this interesting link about Chanterelles cultivation. It's very scientific but worth reading. Here a snip about a comparison made with other species regarding fruit body formation.
"Primordial development in C. cibarius and other species was described by Reijnders (1963). Two important questions in this regard are: What triggers fruit body formation, and is it possible to induce fruit body formation in C. cibarius under controlled conditions? I define a trigger as a stimulus (or a combination of stimuli) that cause vegetative mycelium to form hyphal aggregations and dense primordia. This process is called initiation (Manach?re 1980) or carpogenesis (Reijnders 1963). The development of primordia into fruit bodies is a second morphogenetic step, highly dependent on water which is needed for cell elongation (Hammond 1985). For mushroom growers, the "key" to successful fruit body formation is often the creation of an environment suitable for normal primordial development.
Fruit body formation in other fungi
In the saprophytic A. bisporus, bacteria are needed to remove an initiation-inhibiting substance produced by the mycelium itself (Rainey et al. 1990, Rainey 1991). After initiation of primordia, normal development is dependent on high humidity and gas exchange, but light is not needed. It is often recommended that the temperature should be lowered to allow rapid fruiting (Manach?re 1980), but fruit bodies will appear anyway (Danell unpubl. data). The biochemical background seems to be a storage of trehalose and glycogen in mycelium and primordia. Once a certain level of stored carbohydrates is reached, morphogenesis begins with synthesis of mannitol which attracts water and starts cell elongation (Hammond 1985).
In the saprophytic Pleurotus spp., my experience is in accordance with Rajarathnam and Bano (1987): mycelium spontaneously initiate primordia when grown in a constant environment. Continued normal development is dependent on light, high humidity and gas exchange.
For the saprophytic Schizophyllum commune, gas exchange and light are important for initiation and normal development, but the addition of cerebrosides may also induce initiation (Kawai 1987). In the saprophytic Coprinus spp., periods of both darkness and light are important. Initiation is induced by the increase in cAMP levels that occurs as substrate is depleted. Glucose will therefore inhibit initiation. Humidity is important. (Manach?re 1980).
The facultative ectomycorrhizal fungus Chalciporus rubinellus (as Boletus rubinellus Peck.) needs light, gas exchange and high humidity for host independent in vitro fruiting (McLaughlin 1970).
The ectomycorrhizal Hebeloma cylindrosporum spontaneously formed fruit bodies after six weeks in vitro with host plants under constant conditions. Temperature had no effects on the yield of fruit bodies (Debaud & Gay 1987). The fruiting period was 9.5 months. Another ectomycorrhizal fungus, Laccaria bicolor, needed a host and low levels of nitrogen and phosphorus for fruit body formation. Fruiting began 16 weeks after inoculation. A decrease in temperature inhibited fruit body formation. A shorter photoperiod resulted in earlier fruiting. It was suggested that a pool of carbohydrates in the mycelium might be closely related to fruiting. (Godbout & Fortin 1990,1992). "
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