College of Horticulture, Shenyang Agricultural University, Shenyang 110161, China. E. Mail: zblaaa@163.com.
*Correspondence Author
1Information Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201106, China.
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.l−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.
Allelopathy, diisobutyladipate, eggplant, germination, malondialdehyde, root exudates, seedling growth, Solanum melongena L., Verticillium dahliae, verticillium wilt
