Abstract:

The study of extracellular proteins and combination of enzymes of Dendroctonus armandi adult insects gut and its symbiotic fungus in the Qinling Mountains results showed that there were cellulase,hemicellulase,amylade,protease and esterase in the secretions of Dendroctonus armandi , whereas cellulase,hemicellulase,amylase,protease,esterase and laccase can be detected in symbiotic fungus At the same time,isoenzyme zymogram showed that cellulase,amylase,protease,esterase from symbiotic fungus and from the Dendroctonus armandi were difierent in the species and structure of enzyme This proved that Bark Beetle and symbiotic fungus can be utilized nourishing substances of phloem and xylem in host trees such as protein,cellulose,amylum,amylose,esters,but also symbiotic fungus can be utilized lignin in the induced lignose of host trees

Key words: Dendroctonus armandi, Symbiotic fungus, Gut, Extracellular enzyme