Implicated in the defense of plants against pathogens. Hydrolysis of (1->3)-beta-D-glucosidic linkages in (1->3)-beta-D-glucans. Maximum expression found during days 4 to 8 and days 8 to 12 after inoculation with an avirulent and a virulent pathogen respectively. Upon infection by virulent and avirulent races of pathogens, for example fungal pathogen C.fulvum. Belongs to the glycosyl hydrolase 17 family.