Effects of diisobutyladipate on verticillium wilt (Verticillium dahliae) and seedling growth of eggplant

In Simulation method, the effects of diisobutyladipate present in root exudates of grafted eggplant were determined on verticillium wilt (Verticillium dahliae Kleb.) and seedling growth of eggplant. Its 4 concentrations (0, 0.1, 0.5 and 1.0 mmol.1(-1)) were evaluated, which significantly suppressed the mycelium growth of V dahliae in early stages. At 7 days, the 1 mmol-l(-1) concentration was most inhibitory. however. it became stimulatory at 11 days. Field investigations indicated that all concentrations of diisobutyladipate enhanced the disease resistance of eggplants and the highest resistance was recorded at 0.5 mmol-l(-1). Diisobutyladipate stimulated the seed germination and seedling growth of eggplant at low concentration but caused allelopathic inhibition at high concentration. The diisobutyladipate at low concentration inhibited the malondialdehyde content and the relative electrical conductivity and the inhibitory rates were enhanced with increase in concentration.