The cellulase complex in T. viride is inducible. For large-scale enzyme production the fungus should be cultured on media containing cellulose. The cellulase enzymes are respressible. To produce and maintain best cellulase yields cultural conditions which lead to carbohydrate consumption in excess of cellular needs should be avoided. With the present mutant (QM9414) extracellular enzyme preparations having 1.6 FP units/ml and 1.6 mg protein/ml have been obtained within four to five days in submerged fermentation. Such preparations are capable of producing a 5% sugar solution when mixed with 10% ball milled cellulose and incubated 24 hr at 50 degrees C. Further improvements of cellulase yields are being sought by continued mutagenesis and increased nutrient levels in the growth medium.
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