Hydrolyzes inulin-type beta-(2,1)-fructans and beta-(2,1)-linkages in branched fructans. Has low activity against beta-(2,6)-linked fructans. May play a role as a beta-(2,1)-trimmer during graminan biosynthesis. Hydrolysis of terminal, non-reducing (2->1)-linked beta-D-fructofuranose residues in fructans. Inhibited by sucrose. Optimum pH is 5-6. Optimum temperature is 25-40 degrees Celsius. Expressed in the stem, particularly the penultimate internode. Little expression is detected in roots and in the peduncle part of the stem. Belongs to the glycosyl hydrolase 32 family.