Identification of Leaf Blast Resistance Genes Derived from a Korean Weedy Rice, Ganghwaaengmi 11
2010
Suh, J.P., National Institute of Crop Science, RDA, Suwon, Republic of Korea | Cho, Y.C., National Institute of Crop Science, RDA, Suwon, Republic of Korea | Kim, J.J., National Institute of Crop Science, RDA, Suwon, Republic of Korea | Shin, Y.S., National Institute of Crop Science, RDA, Suwon, Republic of Korea | Yang, C.I., National Institute of Crop Science, RDA, Suwon, Republic of Korea | Roh, J.H., National Institute of Crop Science, RDA, Suwon, Republic of Korea | Kim, Y.G., National Institute of Crop Science, RDA, Suwon, Republic of Korea
A weedy rice, Ganghwaaengmi 11, shows high level of leaf blast resistance. The chromosomal number and locations of genes conferring the leaf blast resistance were detected by QTL (quantitative trait loci) analysis using SSR markers in the 120 RILs (recombinant inbred lines) derived from the cross between Nagdongbyeo and Ganghwaaengmi 11. Ganghwaaengmi 11 expressed compatibility with 20 of the 45 inoculated blast isolates, in contrast to Nagdongbyeo with 44 compatible isolates. To identify QTLs affecting partial resistance, RILs were assessed in upland blast nursery in three regions and inoculated with selected nine blast isolates. QTLs for resistance to blast isolates were identified on chromosomes 7, 11 and 12. Three QTLs associated with blast resistance in nursery test at three regions were also detected on chromosomes 7, 11 and 12. The QTL commonly detected on chromosome 12 was only increased blast resistance by Ganghwaaengmi 11 allele. This QTL accounted for 60.3~78.6% of the phenotypic variation in the blast nursery test. OSR32 and RM101 markers tightly linked to QTL for blast resistance on chromosome 12 might be useful for marker-assisted selection (MAS) and gene pyramiding to improve the blast resistance of japonica rice.
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