Fig. 4.

(A) Thermostability and (B) pH stability of antifungal activity of sorghum XILP toward Mycosphaerella arachidicola. The same amount (2 μg) of antifungal was added to each paper disc (except the control disc labelled as (C). The numbers in panel (A) (50–100) near the paper discs represent the various temperatures at which the XILP had been pretreated for 10 min before assay for antifungal activity. The numbers in panel (B), (1–4) on left plate and (10–14) on right plate represent the various pH values (prepared using NaOH and HCl solutions) to which the XILP had been exposed for 30 min before neutralisation and then assay for antifungal activity.