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Development of Monogenic and Digenic Rice Lines for Blast Resistance Genes Pi‐ta, Pi‐kh/Pi‐ks

The major blast resistance (R) genes Pi-ta, Pi-k s , Pi-k h have been effectively deployed in rice (Oryza sativa L.) in the southern USA for preventing disease caused by the predominant U.S. races of Magnaporthe oryzae Cav. [=Magnaporthe grisea (Herbert) Barr.]. In the present study, the codominant single nucleotide length polymorphism DNA marker for the Pi-ta gene, and the simple sequence repeat markers, RM144 and RM224, that cosegregate with two alleles of the Pi-k gene, Pi-k s and Pi-k h , were used for R identification in a F 10 recombinant inbred line population. This population (Reg. no. MP-3, NSL 452303) was derived from the cross RU9101001/'Katy'. This population composed of 235 individual lines was jointly released on 24 Apr. 2009 by the USDA-ARS and the University of Arkansas Division of Agriculture Arkansas Agriculture Experiment Station. R gene containing RIL lines were verified with standard pathogenicity assays by means of a set of differential races of M. oryzae in the USA. One hundred eighty-two pure lines were identified from the population with the Pi-ta, Pi-k s , and Pi-k h genes. A total of 56 had Pi-ta and Pi-k s , 51 lines had Pi-k s , 27 had Pi-k h , and 48 lines had Pi-k h and Pi-ta. These monogenic and digenic rice lines with the major blast R genes are expected to be useful for studying effects of each R gene singly and in combination for their epistatic interaction with yield and for introducing blast resistance with marker assisted selection.