The present investig ation was carried out with a view to pyram id Bacterial Blight resistance genes, Xa4, xa5, xa13 and Xa21 in the background of Pusa 1121, Pusa 2511 and advance breeding lines from PB 1 / IR BB 60 // Pusa 1302 using IRBB 60 as donor line f or all the four gene s. The specific obj ectives of the study were, (...