EFFECTS OF ENVIRONMENTAL FACTORS ON FORMATION OF LIGNIN IN EUCALYPTUS CAMALDULENSIS DEHN. GROWN IN KHOSESTAN-IRAN

Abstract

Peroxidases are enzymes which catalyse two final steps in the wood lignin biosynthesis. The connection between xylem peroxidase activities and wood xylem lignifications was examined by determining peroxidase activities in the stems of eucalypt (Eucalyptus camaldulensis Dehn.) trees during two seasons in 1999over the period of annual growth. In addition, samples from the same trees were examined for lignin content. This study clarifies the possible roles of this enzyme in lignin biqsynthesis and forms a background for further work on the last steps in lignin polymerisation. The peroxidase activity of some samples was lower in Autumn. But in the others there was a great increase in Autumn vs. Winter. Though in Autumn there were more isoenzyme. The results show a relation between lignifications and Peroxidase enzyme zones. In Eucalyptus camaldulensis Dehn. in khozestan