Chitinase is a group of enzymes which catalyze the hydrolysis ofβ-1,4-glycosidic bonds of chitin, an important component of many fungal cell wall. With the antifungal activity, chitinase has i attracted a lot of efforts to enhance plant resistance to pathogens by overexpressing this kind of genes in plants. In this study, we prepared a Beauveria bassiana chitinase Bbchitl using Pichia pastoris expression system, and determined the inhibition effects of Bbchitl on spore germination and mycelial gr...