High-resolution mapping and gene prediction of Xanthomonas Oryzae pv. Oryzae resistance gene Xa7
文献类型： 外文期刊
作者： Chen, Shen 1 ; Huang, Zhanghui 2 ; Zeng, Liexian 1 ; Yang, Jianyuan 1 ; Liu, Qiongguang 2 ; Zhu, Xiaoyuan 1 ;
作者机构： 1.Guangdong Acad Agr Sci, Plant Protect Res Inst, Guangzhou 510640, Peoples R China
2.S China Agr Univ, Coll Resources & Environm Sci, Lab Plant Bacteria, Guangzhou 510642, Guangdong, Peoples R China
期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）
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收录情况： SCI
摘要： Bacterial blight (BB) caused by Xanthomonas oryzae pv. oryzae (Xoo) is a devastating disease in rice worldwide. The resistance gene Xa7, which provides dominant resistance against the pathogen with avirulence (Avr) gene AvrXa7, has proved to be durably resistant to BB. A set of SSR markers were selected from the gramene database based on the Xa7 gene initial mapping region on chromosome 6. These markers were used to construct a high-resolution genetic map of the chromosomal region surrounding the Xa7 gene. An F mapping population with 721 highly susceptible individuals derived from a cross between the near isogenic lines (NILs) IRBB7 and IR24 were constructed to localize the Xa7 gene. In a primary analysis with eleven polymorphic SSR markers, Xa7 was located in approximately the 0.28-cM region. To walk closer to the target gene, recombinant F individuals were tested using newly developed STMS (sequence tagged microsatellite) markers. Finally, the Xa7 gene was mapped to a 0.21-cM interval between the markers GDSSR02 and RM20593. The Xa7-linked markers were landed on the reference sequence of cv. Nipponbare through bioinformatics analysis. A contig map corresponding to the Xa7 gene was constructed. The target gene was assumed to span an interval of approximately 118.5-kb which contained a total of fourteen genes released by the TIGR Genome Annotation Version 5.0. Candidate-gene analysis of Xa7 revealed that the fourteen genes encode novel domains that have no amino acid sequence similar to other cloned Xa(xa) genes.
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