Description:
Great Northern BC5F3:6 line obtained from 5 backcrosses ('Weihing'*5//'Chase'/XAN 159). First cross was made in spring 1997. Only BCnF1 plants resistant to Xanthomonas campestris isolates Dominican Republic DR-7 and Nebraska SC4A as determined by multiple needle leaf inoculation tests in the greenhouse were used for successive backcrossing. In addition to phenotypic selection for CBB resistance, marker-assisted selection for the resistant QTL-linked markers SU91 and SAP6 was conducted in the BC1F1 and BC2F1.