Abstract:

Five different carbon sources were used to study the induction of extracellular cell wall-degrading enzymes (CWDEs) from Fusarium oxysporum f.sp. cubense race4 (FOC-R4). The results showed that wheat bran and pectin can effectively induce cellulase (endo-1, 4-β-D-glucanase and β-D-glucosidase) and pectinase (polygalacturonase) from FOC-R4 respectively in vitro. It is indicated that both cellulase and pectinase can degrade pseudostem tissues of different cultivars of Musa spp., and the degradability of the latter was stronger than that of the former. After being treated for 24 hours with crude pectinase solution, reducing sugar content released by susceptible cultivars was about 1.82 folds of resistant ones, there were differences in sensitivity and resistance between resistant and susceptible cultivars to FOC-R4.