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. High levels in leaves. Appreciable amounts in stems, roots, and sepals. Tubers, root tips, and all other flower organs contain very low levels of enzyme. Highest levels in old segments of leaves, stems and roots. In leaves, in response to infection, elicitor, ethylene, or wounding. Belongs to the glycosyl hydrolase 17 family.