1994 Volume 60 Issue 4 Pages 507-513
The diagnosis at early stages of infection with soil-borne pathogens in eggplant was tried by the measurement of enzyme activities in leaves. The leaves of eggplants were inoculated with Verticillium dahliae, Fusarium oxysporum f. sp. melongenae and Pseudomonas solanacearum and the enzyme activities of peroxidase, polyphenol oxidase, phenylalanine ammonia lyase, β-1, 3-glucanase (Glc), superoxide dismutase (SOD), polygalacturonase, pectin methylesterase and amylase (Amy), were measured. The leaves of eggplant infected with V. dahliae showed higher activities of Glc and Amy than the healthy and the other diseased leaves. The Amy activity of the leaves infected with F. oxysporum was slightly higher than that of healthy leaves, but the difference between the Amy activities of the leaves infected with F. oxysporum and P. solanacearum was not clear. The leaves of eggplant infected with P. solanacearum showed higher activity of SOD. The usefulness of the measurement of enzyme activities for a rapid diagnosis for diseases was discussed.
