“…Enzymatic degradation of cellulose is an important step in bioethanol production from plant biomass, it requires synergistic action of multiple enzymes, mainly endo-β-1,4glucanase, cellobiohydrolase (exo-glucanase) and β-glucosidase (Fujita et al, 2004). Beta-glucosidases are present in bacteria, fungi and plants and show hydrolytic activity on cellobiose and aromatic compounds such as arbutin and silicin present in some plant tissues (Tajima et al, 2001;Spiridonov and Wilson, 2001;Park et al, 2002;Bogas et al, 2007). Enzymatic systems lacking β-glucosidase or those producing it in small amounts show incomplete saccharification of plant cellulose and usually show product inhibition (Gusakov and Sinitsyn, 1992).…”