Abstract
The rice bacterial blight resistance gene, Xa2, confers resistance to T7147 of the bacterial blight pathogen Xanthomonas oryzae pv. oryzae. It is located on the long arm of chromosome 4. Here, we report the fine mapping of Xa2 by genetic recombination analysis with simple sequence repeat (SSR) markers according to the genome sequence. Two F2 populations are constructed to localize Xa2. In a primary analysis with 136 random F2 plants of Zhenzhuai/IRBB2, it was found that Xa2 was located in approximately 20 cM region. To accurately determine the locus of Xa2, 120 new SSR markers were developed in this region by screening the sequence. Twelve new SSR markers were successfully used in genetic recombination analysis in IR24/IRBB2 population, while 20 in ZZA/IRBB2 population. We found that the nearest SSR markers to Xa2 are HZR950-5 and HZR970-4, which cover approximately 190-kb region. The sequence analysis of this 190-kb region revealed the presence of a homologous sequence of leucine rich repeat (LRR)-kinase. These results are very useful for transferring or pyramiding Xa2 by molecular marker-assistant selection in rice breeding programs and for cloning Xa2 by map-based cloning in combination with a long-range PCR strategy.
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He, Q., Li, D., Zhu, Y. et al. Fine Mapping of Xa2, a Bacterial Blight Resistance Gene in Rice. Mol Breeding 17, 1–6 (2006). https://doi.org/10.1007/s11032-005-8698-2
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DOI: https://doi.org/10.1007/s11032-005-8698-2