Improvement of Bacterial Blight Resistance of II-32B by Molecular Marker-Assisted Selection
Rice bacterial blight(BB) is one of the most destructive diseases of rice. In this study, IRBBL23 was used as the donor of resistant gene Xa23 and Ⅱ-32B as a recurrent parent. Progenies were detected with CP02662 a closely linked marker. Combined by methods of field resistance test and marker-assisted selection, 6resistant lines were obtained. The length of disease is between 0.34~1.34 cm. The recovery genetic background was analyzed by 178 SSR primers evenly distributed over the whole genome. 6 resistant improved maintainer lines were obtained with the rate of recovery of genetic background from 96% to 100%. Basically recovered to the recurrent parental genotype.