It is important for basmati rice, a popular aromatic rice but highly susceptible to bacterial blight, to have resistance to the disease. Fifteen elite lines derived from the cross between basmati derived line IR71730-51-2 and IRBB60 have been selected which contain combinations of the genes Xa4, xa5, xa13 and Xa21 for bacterial blight resistance and the aroma gene. Bulk analysis of these lines is sufficient in confirming the presence of the genes when the lines are to be released as varieties. Breeders retain some amount of diversity which is more desirable when grown under farmers' field condition. On the other hand, breeding for resistant varieties require a stable source of genes for resistance. Analysis of individual plants will ensure that the lines are pure and the genes are in the homozygous condition.
Das, A.; Oña, I.P.; Begum, S.N.; Lopena, V.; Capilit, G.S.; Virk, P.; Vera Cruz, C.M.; Reveche, M.Y.V.; Mercado, E.F.L.; Carrillo, M.G.C. Confirmation of Xa genes introgressed into elite basmati derived lines. Presented at the 2nd International Bacterial Blight Conference, 1-4 October 2007, Nanjing, China. (2007) 1 pp.