Effect of Substrate Bulk Density on Mycelial Characteristics and Fruiting of Auricularia heimuer
Using a mechanical pressing device,Auricularia heimuer cultivation substrate bags(Quercus mongolica sawdust as the major substrate component)of different bulk densities[0.72,0.80(CK),0.88,0.96,and 1.04 g·cm-3]were prepared through wet heat molding.Then the cultivation bags of the aforementioned densities were compared for mycelial growth rate,CO2 release,water volatilization intensity,dry matter consumption,pH,electrical conductivity,extracellular enzyme activities,lignocellulose content,the first-flush yield and agronomic traits of fruiting bodies.The results showed that in the experimental range,when the bulk density was 0.72 g-cm-3,the lateral and vertical mycelial growth rates were greater than those of the control.Compared with the control,the bulk density of 0.72 g·cm-3also resulted in higher consumption of dry matter,less volumetric reduction,higher pH,higher electrical conductivity,and higher contents of lignin and cellulose.The fruiting bodies developed on the substrate of 0.72 g·cm-3 showed short fruiting time[(8.00±1.00)d],long ear pieces[(8.93±1.29)cm],thick ear pieces[(0.39±0.09)mm],relatively low hardness[(1.62±0.08)N]and a low rehydration rate(7.31±0.59).The results provided a reference for selecting substrate bulk density in A.heimuer cultivation.
Bag cultivation of Auricularia heimuersubstrate bulk densitymycelial growthdry matter consumptionlignocellulose degradation
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