Is thought to be an important plant defense-related product against fungal pathogens. Hydrolysis of (1->3)-beta-D-glucosidic linkages in (1->3)-beta-D-glucans. Accumulates in aleurone layers. Much lower levels are found in the embryo, and none in starchy endosperm. By pathogen infection. Belongs to the glycosyl hydrolase 17 family.