Abstract: Allelopathy of hexanedioic acid, bis(2-methylpropyl) ester exudated by grafted eggplant roots to Verticillium wilt（Verticillium dahllae）and seedling growth was studied by using simulative method. The results showed that hexanedioic acid, bis(2-methylpropyl) ester had a significant suppression to the mycelium growth in early stage during culturing Verticillium dahllae. When the mycelium growing to 7 d, 1 mmol·L^-1 had the best inhibitory effect. Until 11 d, hexanedioic acid, bis(2-methylpropyl) ester promoted the mycelium growth. The results of field investigation indicated that hexanedioic acid, bis(2-methylpropyl) este enhanced the disease resistance of eggplants at all the concentrations and the best effect presented in 0.5 mmol·L^-1 treatment. Hexanedioic acid, bis(2-methylpropyl) ester exhibited allelopathic promotion at a low concentration and allelopathic inhibition at a high concentration on eggplant seed germination, seedling growth. While the MDA content and relative electricity conductivity were inhibited by hexanedioic acid, bis(2-methylpropyl) ester at a low concentration, and the inhibitory rates were enhanced with the increasing concentration. Up to 1 mmol·L^-1, hexanedioic acid, bis(2-methylpropyl) ester presented allelopathic promotion.

Key words: root exudate, hexanedioic acid, bis(2-methylpropyl) ester, allelopathy, Verticillium wilt