Abstract: This paper studied the effects of grafted eggplant root exudates on the mycelium growth of Verticillium dahliae, effects of grafting on eggplant rhizosphere soil enzyme activity, V. dahliae amount, and microbial population, and effects of aqueous extracts of alternately and continuously cropped grafted eggplant soils on eggplant’s seed germination and seedling growth. The results showed that in 4〖KG-*2〗-〖KG-*7〗5 days incubation, grafted eggplant root exudates inhibited the mycelium growth of V. dahliae significantly. In grafted eggplant rhizosphere soil, the dehydrogenase, peroxidase and polyphenol oxidase activities were generally higher, and the V. dahliae amount at different growth stages of eggplant was all significantly lower, compared with those in non-grafted eggplant rhizosphere soil. Grafting changed the rhizosphere soil microbial community structure, i.e., increased the amount of bacteria and actinomyces and decreased the amount of fungi, resulting in an increase of the ratios of bacteria to fungi and of actinomyces to fungi. The aqueous extracts of alternately and continuously cropped grafted eggplant soils promoted eggplant’s seed germination and seedling growth (except root length), while the extracts of continuously cropped self-rooted eggplant soil inhibited the seed germination and seedling growth.

Key words: Brassica parachinensis, Clletotrichum higginsianum, Nitrogen nutrition, Endogenous hormones