May provide a degree of protection against microbial invasion of germinated barley grain through its ability to degrade fungal cell wall polysaccharides. Does not hydrolyze (1,3;1,4)-beta-D-glucans, (1,6)-beta-D-glucan, CM-cellulose, insoluble (1,3)-beta-D-glucans or aryl beta-D-glycosides. Hydrolysis of (1->3)-beta-D-glucosidic linkages in (1->3)-beta-D-glucans. Optimum pH is 4.8. Monomer. Young leaves and roots. First detected in young leaves ten days after initiation of germination. Also detected in young roots but not in mature leaves or roots. Belongs to the glycosyl hydrolase 17 family.