Two QTLs, qSBPH4-a and qSBPH12-a1 were also
identified at the same region of RM451-RM5473, and
RM519-RM3331 using BC1 population (Fig. 3), with
LOD scores of 2.72, 34.96 and QTLs explained 1.49 and
40.04% of the phenotypic variance respectively. The two
QTLs also came from Rathu Heenati (Table 5). These
results indicated that a major QTL qSBPH12-a1 and some
minor QTLs controlled Small brown planthopper resistance
in Rathu Heenati.