Marker-assisted improvement of bacterial blight resistance in parental lines of Pusa RH10, a superfine grain aromatic rice hybrid

Molecular Breeding - Tập 26 - Trang 293-305 - 2010
S. H. Basavaraj1, Vikas K. Singh1, Atul Singh1, Ashutosh Singh1, Anita Singh1, Deepti Anand1, Sheel Yadav1, Ranjith K. Ellur1, Devinder Singh1, S. Gopala Krishnan1, M. Nagarajan2, T. Mohapatra3, K. V. Prabhu1, Ashok K. Singh1
1Rice Section, Division of Genetics, Indian Agricultural Research Institute, New Delhi, India
2Rice Breeding and Genetics Research Centre, IARI, Aduthurai, India
3National Research Centre on Plant Biotechnology, Indian Agricultural Research Institute, New Delhi, India

Tóm tắt

Pusa RH10, the widely cultivated superfine grain aromatic rice hybrid, and its parental lines Pusa6B and PRR78 are susceptible to bacterial blight (BB) disease caused by Xanthomonas oryzae pv. oryzae. Pusa1460, a Basmati rice variety, was utilized as the donor for introgressing BB resistance genes xa13 and Xa21 into Pusa6B and PRR78 using a marker-assisted backcross breeding program. The markers RG136 and pTA248 linked to BB resistance genes xa13 and Xa21, respectively, were used for foreground selection. Seventy-four STMS markers polymorphic between Pusa6B and Pusa1460, and 54 STMS markers polymorphic between PRR78 and Pusa1460, were utilized for background selection to recover the recurrent parent genome ranging from 85.14 to 97.30% and 87.04 to 92.81% in the 10 best BC2F5 families of Pusa6B and PRR78, respectively. RM6100, an STMS marker linked to fertility restorer gene (Rf), was used for marker-assisted selection of Rf gene in an improved version of PRR78. The extent of donor segments in the improved version of Pusa6B was estimated to be <0.97 and <2.15 Mb in the genomic regions flanking xa13 and Xa21, respectively, whereas in improved PRR78, it was estimated to be <2.07 and <3.45 Mb in the corresponding genomic regions. Improved lines of Pusa6B and PRR78 showed yield advantages of up to 8.24 and 5.23%, respectively. The performance of the BB-resistant version of Pusa RH10 produced by intercrossing the improved parental lines was on a par with or superior to the original Pusa RH10.

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Molecular Breeding

Tập 26

293-305

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