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Three rice mapping populations of 208 BC 1 F 2 , 333 BC 3 F 2 and 335 F 2 lines derived from crosses of PTB33 × RD6, Rathu Heenati × KDML105 and IR71033-121-15 × KDML105, respectively, were used to detect brown planthopper (BPH) resistance genes. The modified mass tiller screening (MMTS) method was applied to evaluate the BPH resistance of all mapping population lines at the tillering stage. The BPH resistance genes detected from the BC 1 F 2 , BC 3 F 2 and F 2 populations were mapped in the same genomic region on the short arm of chromosome 6. The tightly linked markers RM589 and RM586 could explain 59.8%, 28.2% and 57.4 % of the phenotypic variance of the BPH resistance from the BC 1 F 2 , F 2 and BC 3 F 2 , respectively. The tightly linked SSR markers identified from this study should be useful in marker-assisted breeding to produce BPH resistant cultivars.

Three rice mapping populations of 208 BC 1 F 2 , 333 BC 3 F 2 and 335 F 2 lines derived from crosses of PTB33 × RD6, Rathu Heenati × KDML105 and IR71033-121-15 × KDML105, respectively, were used to detect brown planthopper (BPH) resistance genes. The modified mass tiller screening (MMTS) method was applied to evaluate the BPH resistance of all mapping population lines at the tillering stage. The BPH resistance genes detected from the BC 1 F 2 , BC 3 F 2 and F 2 populations were mapped in the same genomic region on the short arm of chromosome 6. The tightly linked markers RM589 and RM586 could explain 59.8%, 28.2% and 57.4 % of the phenotypic variance of the BPH resistance from the BC 1 F 2 , F 2 and BC 3 F 2 , respectively. The tightly linked SSR markers identified from this study should be useful in marker-assisted breeding to produce BPH resistant cultivars.