Abstract:

In order to evaluate the capability of lignin degradation and pitch elimination from Masson pine chips by nature white-rot fungi , 20 white-rot fungus strains were obtained by petri dishes screening and petri dishes color-re-action screening. One G strain with the lowest MyceVCol value was then inoculated onto the surface of Masson pine chip , and the degradation rates of lignin and pitch were measured after 3 , 5 , 7 , 9 days , respectively. The results indicate that , with the increase in inoculation time , the losing rate of wood mass and the elimination of methylene chloride extractive gradually increase , while the contents of Klason lignin and the totallignin decrease. It is also in-dicated by SEM that there exist obvious moldy grooves on the cell walls of Masson pine chip. Moreover , the results of the cross-sectional slice-up study show that hypha develops on the cell walls and the intercellular layers.

Key words: white-rot fungus, screening, lignin, pitch, degradation