Resistance to Xanthomonas campestris pv. campestris (Pammel) Dowson in cabbage Brassica oleracea L.

摘要

Xanthomonas campestris pv. campestris (Xcc) is one of the most important pathogens of Brassica oleracea vegetables. To develop resistant basic breeding material, several cultivars, breeding lines, and crosses of B. oleracea were evaluated. A number of Xcc strains from Europe, Japan, and South Africa were tested for virulence and membership to races. Among 28 highly virulent strains of the pathogen isolated in Germany, 68 % belong to race 1 and 32 % to race 4. Plants were inoculated in the juvenile stage by spraying with a mixture of several highly virulent strains of the most widely distributed races 1 and 4. Some cabbage cultivars that are described to be tolerant to Xcc proved to be susceptible.