Physiological Races of Genetic Differentiation of Tobacco Angle Spot Pathogenic Bacteria in Heilongjiang Province

To identify the heredity differentiation of physiologic races of Heilongjiang Pseudomonas syringae pv. tabaci, total 19 isolates of Pseudomonas syringae pv. tabaci collected from Heilongjiang province were inoculated onto 36 tobacco varieties using pin-prick inoculation. Differential host was screened out by difference analysis and cluster analysis on disease index to determine the resistance of the varieties tested, which was selected to identify different physiologic races of Pseudomonas syringae pv.tabaci. According to the above system, the 19 isolates were divided as 5 physiologic races.