FIGURE 3.

Maize β-glucosidases were recovered in active form after digestion by S. littoralis larvae. Enzymatic activity levels were determined in non-ingested material and after digestion of diet cubes spiked with semi-purified maize β-glucosidase (A), or after feeding on maize leaf tissue (B). Activities were measured either using the non-specific β-glucosidase substrate pNPG (A) or the endogenous plant substrate DIMBOA-Glc (B). Shown are the means ± standard errors [N = 3 in both analyses; P = 0.2 (A) and P = 0.3 (B)].