GENOMIC CHARACTERIZATION OF RICE GERMPLASM
Location: Dale Bumpers National Rice Research Center
Title: TWO MAJOR RESISTANCE GENES CONFER RESISTANCE TO RACE SHIFT ISOLATES OVERCOMING BLAST RESISTANCE GENC PI-TA
Submitted to: Arkansas Agricultural Experiment Station Research Series
Publication Type: Experiment Station
Publication Acceptance Date: June 17, 2005
Publication Date: August 9, 2005
Citation: Jia, Y., Wamishe, Y., Jia, M.H., Lin, M.J., Eizenga, G.C., Gibbons, J.W., Moldenhauer, K..K.., Correll, J.C. 2005. Two major resistance genes confer resistance to race shift isolates overcoming blast resistance genc Pi-ta. In: Norman, R.J., Meullenet, J.-F., Moldenhauer, K.S.K., editors. B.R.Wells Rice Research Studies 2004, Arkansas Agricultural Experiment Station Research Series 529. p. 91-95 Available: http//www.uark.edu/depts/agripub/Publications/researchseries/.
One of the major challenges for blast disease management is that major resistance genes are often defeated by new virulent isolates. The goal of this project is to identify and characterize blast resistance genes to facilitate the development of blast resistant US cultivars by marker-assisted selection. A combination of genetic, molecular and pathological approaches was used to identify and map novel major blast resistance genes. A Raminad Str. 3/RU9101001 F2 population was initially used for pathogenicity tests and mapping. Segregation analysis indicates two major R genes from Raminad Str. 3 confer resistance to the race shift isolate TM2 (IE-1k). To establish the frame for the map position, a recombinant inbred population of Zhe733/Kaybonnet low phytic acid (KBNTlpa1-1) was used to develop the genetic map. One of the major genes designated Pi-Zhe733 (t) was tentatively mapped near a known major resistance gene Pi-z. Another R gene designated Pi-Zhe733b (t) was tentatively mapped on chromosome 11 distal to the Pi-k locus. Two resistance genes to IE-1k in Zhe733 also were confirmed by an additional Zhe733/C101A51F2 population and this population is being used for fine mapping.