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Haplotype analysis of major blast resistance (R) genes in rice; Pi9, Pia, and Pib
Rice blast disease caused by the fungal pathogen Magnaporthe oryzae is one of the most destructive rice diseases worldwide. Resistance to rice blast pathogen mostly shows a quantitative trait controlled by several genes. A total of 13 major blast resistance (R) genes were reported in a number of Korean rice varieties using molecular markers. The Pi-ta gene, which locates near to the centromere of chromosome 12, was haplotyping using 1790 accessions including cultivated and wild varieties in previous research. However, the genetic variations of other R genes in rice still not clear. Three R genes, Pi9, Pia, and Pib on chromosome 6, 11 and 2 respectively, were resequenced among 84 accessions of rice core set. Different types of halotype among the 84 accessions were detected. Some new SNPs and InDels found in exon part of R genes were expected to result into amino acid changes following analysis of the genetic code variations, and the germplam in this rice core set which are resistance to blast were explored. We are expecting to develop the new functional markers and incorporate of resistance genes into existing rice cultivars and finally these apply outcomes in breeding rice resistance to blast diseases.
