Allele-mining of rice blast resistance genes at AC134922 locus |
| |
Authors: | Dan Wang Changjiang Guo Ju Huang Sihai YangDacheng Tian Xiaohui Zhang |
| |
Institution: | State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, 210093 Nanjing, China |
| |
Abstract: | The AC134922 locus is one of the most rapidly evolving nucleotide binding site-leucine-rich repeat (NBS-LRR) gene family in rice genome. Six rice blast resistance (R) genes have been cloned from this locus and other two resistance candidate genes, Pi34 and Pi47, are also mapped to this complex locus. Therefore, it seems that more functional R genes could be identified from this locus. In this study, we cloned 22 genes from 12 cultivars based on allele-mining strategy at this locus and identified 6 rice blast R genes with 4 of them recognizing more than one isolates. Our result suggests that gene stacking might be the evolutionary strategy for complex gene locus to interact with rapidly evolving pathogens, which might provide a potential way for the cloning of durable resistance genes. Moreover, the mosaic structure and ambiguous ortholog/paralog relationships of these homologous genes, caused by frequent recombination and gene conversion, indicate that multiple alleles of this complex locus may serve as a reservoir for the evolutionary novelty of these R genes. |
| |
Keywords: | Resistance AC134922 Allele-mining Gene conversion |
本文献已被 ScienceDirect 等数据库收录! |
|