Abstract:In order to investigate resistance mechanism of kiwifruit varieties to Pseudomonas syringae pv. actinidae, experiments were conducted with the main cultivars of kiwifruits, Jinkui (HR), Zaoxian (MR), Kuimi (R), Qinmei (S), Huamei 2 (MS), and Jinfeng (HS), in Anhui Province. The morphological results showed that branch skin hole density, length and blade stoma density, length and width of susceptible varieties were larger than those of resistant varieties. Meanwhile, they were in correlation with disease incidence. There were differences in skin hole and stoma lining situation among the varieties, too. The physiological and biochemistry results showed that POD activity in bud was not much regular with different varieties, while POD activities in branch of one year and leaf were significantly correlated with different varieties preinfection. POD activity ascended both in susceptible and resistant varieties postinfection, but it increased faster in resistant varieties than in susceptible varieties. And the bigger the spot was, the higher POD activity was. The changes of POD isozyme were similar to those of POD activity.