May provide a degree of protection against microbial invasion of germinated barley grain through its ability to degrade fungal cell wall polysaccharides (PubMed:1899089). Hydrolyzes laminarin in vitro (PubMed:8514770). Hydrolysis of (1->3)-beta-D-glucosidic linkages in (1->3)-beta-D-glucans. Optimum pH is 4.5 (at 37 degrees Celsius). Belongs to the glycosyl hydrolase 17 family.