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Basmati rice is preferred internationally because of its appealing taste, mouth feel and aroma. Pusa Basmati 1121 (PB1121) is a widely grown variety known for its excellent grain and cooking quality in the international and domestic market. It contributes approximately USD 3 billion to India’s forex earning annually by being the most traded variety. However, PB1121 is highly susceptible to bacterial blight (BB) disease. A novel BB resistance gene  Xa38  was incorporated in PB1121 from donor parent PR114- Xa38  using a modified marker-assisted backcross breeding (MABB) scheme. Phenotypic selection prior to background selection was instrumental in identifying the novel recombinants with maximum recovery of recurrent parent phenome. The strategy was effective in delimiting the linkage drag to <0.5 mb upstream and <1.9 mb downstream of  Xa38  with recurrent parent genome recovery upto 96.9% in the developed NILs. The NILs of PB1121 carrying  Xa38  were compared with PB1121 NILs carrying  xa13 + Xa21  (developed earlier in our lab) for their resistance to BB. Both NILs showed resistance against the Xoo races 1, 2, 3 and 6. Additionally,  Xa38  also resisted Xoo race 5 to which  xa13  +  Xa21  was susceptible. The PB1121 NILs carrying  Xa38  gene will provide effective control of BB in the Basmati growing region.

Marker-aided Incorporation of Xa38, a Novel Bacterial Blight Resistance Gene, in PB1121 and Comparison of its Resistance Spectrum with xa13 + Xa21