A bifunctional beta-xylosidase/alpha-L-arabinosidase, exo-enzyme that acts synergistically with endohydrolases. Releases xylose and arabinose from cell walls (By similarity). Hydrolysis of (1->4)-beta-D-xylans, to remove successive D-xylose residues from the non-reducing termini. Hydrolysis of terminal non-reducing alpha-L-arabinofuranoside residues in alpha-L-arabinosides. Strongly expressed in young roots, significantly reduced expression in older roots. Highest expression levels seen in root tips, some expression seen in root nodules and in the flowers, but not seen in other aerial parts of the plant such as in the stems, hypocotyls or leaves. Belongs to the glycoside hydrolase 3 family.