Identification of quantitative trait loci associated with small brown planthopper (Laodelphax striatellus Fallen) resistance in rice (Oryza sativa L.)

F2 and BC1 populations derived from the cross between 02428 / Rathu Heenati were used to investigate small brown planthopper (SBPH) resistance. Using the F2 population, three QTLs for antixenosis against SBPH were located on chromosomes 2, 5 and 6, and accounted for 30.75% of the phenotypic variance; three QTLs for antibiosis against SBPH were detected on chromosomes 8, 9 and 12. qSBPH5-c explaining 7.21% of phenotypic variance for antibiosis was identified on chromosome 5 using the BC1 population. A major QTL, qSBPH12-a1, explained about 40% of the phenotypic variance, and a minor QTL, qSBPH4-a, was detected by the SSST method in both the F2 and BC1 populations. The QTLs indentified in the present study will be useful for marker assisted selection of SBPH resistance in rice.