Molecular Genetics and Genomics

, Volume 289, Issue 5, pp 745–753 | Cite as

High-resolution genetic mapping of rice bacterial blight resistance gene Xa23

  • Chunlian Wang
  • Yinglun Fan
  • Chongke Zheng
  • Tengfei Qin
  • Xiaoping Zhang
  • Kaijun ZhaoEmail author
Original Paper


Bacterial blight (BB) caused by Xanthomonas oryzae pv. oryzae (Xoo) is the most devastating bacterial disease of rice (Oryza sativa L.), a staple food crop that feeds half of the world’s population. In management of this disease, the most economical and effective approach is cultivating resistant varieties. Due to rapid change of pathogenicity in the pathogen, it is necessary to identify and characterize more host resistance genes for breeding new resistant varieties. We have previously identified the BB resistance (R) gene Xa23 that confers the broadest resistance to Xoo strains isolated from different rice-growing regions and preliminarily mapped the gene within a 1.7 cm region on the long arm of rice chromosome 11. Here, we report fine genetic mapping and in silico analysis of putative candidate genes of Xa23. Based on F2 mapping populations derived from crosses between Xa23-containing rice line CBB23 and susceptible varieties JG30 or IR24, six new STS markers Lj36, Lj46, Lj138, Lj74, A83B4, and Lj13 were developed. Linkage analysis revealed that the new markers were co-segregated with or closely linked to the Xa23 locus. Consequently, the Xa23 gene was mapped within a 0.4 cm region between markers Lj138 and A83B4, in which the co-segregating marker Lj74 was identified. The corresponding physical distance between Lj138 and A83B4 on Nipponbare genome is 49.8 kb. Six Xa23 candidate genes have been annotated, including four candidate genes encoding hypothetical proteins and the other two encoding a putative ADP-ribosylation factor protein and a putative PPR protein. These results will facilitate marker-assisted selection of Xa23 in rice breeding and molecular cloning of this valuable R gene.


Xanthomonas oryzae pv. oryzae Xa23 Fine mapping Rice 



This work was supported by the National High-Technology Research Program (The “863” Program: Grant No. 2006AA10Z106) of Ministry of Science and Technology of China and National Natural Science Foundation of China (Grant No. 31171812).


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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Chunlian Wang
    • 1
  • Yinglun Fan
    • 1
    • 2
  • Chongke Zheng
    • 1
  • Tengfei Qin
    • 1
  • Xiaoping Zhang
    • 1
  • Kaijun Zhao
    • 1
    Email author
  1. 1.National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI) Institute of Crop ScienceChinese Academy of Agriculture Sciences (CAAS)BeijingPeople’s Republic of China
  2. 2.Liaocheng UniversityLiaochengPeople’s Republic of China

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