EFFECTS OF SYNTHETIC NUTRIENT CARRIERS ON THE FRUITING OF PLEUROTUS-OSTREATUS VAR COLUMBINUS

Pleurotus ostreatus var columbinus was cultivated on two kinds of perl ite-defined substrates (PDS). rn a first experiment, PDS with either c ellulose, sugar nitrogen or mineral-starvation were tested using pure washed mycelium as inoculum in reference to grain spawn and compared w ith a wheat-straw substrate. Cellulose, nitrogen and minerals were fou nd to be essential compounds for Pleurotus fruiting. When grain spawn was used as inoculum, nitrogen and minerals supplied by the grain were sufficient for fruiting, in spite of nitrogen and mineral-starvation. Protein content of fruitbodies increased when grown on PDS inoculated with spawn only. In a second experiment, PDS as synthetic substitutes for wheat straw and grass hay were inoculated with pure washed myceli um and compared to natural substrates. In spite of mineral and sugar s upplement, synthetic substitutes for wheat straw gave a fruitbody yiel d lower than that recorded on natural wheat straw. The protein content of fruitbodies harvested from all substrates did not vary.