The effect of impregnation of wood with vegetable oil, tall oil and two water soluble on fungal degradation reactions was assessed by hydrolysis and enzyme activity measurements. The experiments were carried out by using isolated enzyme preparations and a living brown-rot fungus Poria placenta. The results indicate that the inhibitory effect of treatments was clearly directec towards the enzymatic hydrolyzability of the hemicellulosic and cellulosic components of wood cell wall. The water soluble resins and tall oil treatments significantly decreased the ability of isolated enzyme preparation to hydrolyse treated wood substrate. The inhibitory effect of these treatments was focused on the degardation of arabinoxylan and cellulose components of the wood cell wall. The vegetable oil treatment did not significantly prevent the enzymatic hydrolysis of wood substrate. The resin and tall oil treatments seemed also to interfere the production and/or mode of action of hydrolytic degradation pathway of living brown-rot fungus P. placenta.

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