Inheritance of Brown Planthopper Resistance in Rice

Inheritance of the genes governing brown planthopper (BHP), Nilaparvata lugens (Stal), was studied in 15 crosses involving seven susceptible rice varieties: RP 193-1, Prakash, Swarnadhan, Vikram, TKM 8, IR 8, and five resistant donors: Ptb 33, Andrewsali, Velluthacheera, CR 57-MR 1523(MR 1523) and Ptb 21. Based on the results obtained in F1 through F3 generations, BPH resistance was found to be governed by two dominant complementary genes, Bph 5(t), Bph 6(t), in Ptb 33; and three dominant, complementary genes, Bph 6(t), bph 9(t), controlled resistance in Ptb 21 and MR 1523, one of these genes is common to TKM 8. The F1 hybrids as well as f2 and F3 progenies of the susceptible parents did not segregate for BPH resistance, like-wise crosses between resistant parents Ptb 33, Andrewsali and Velluthacheera as well as Ptb 21 with MR 1523 showed no segregation for BPH resistance in the F1, f2 and F3 generations, indicating that the genes are common. Further studies are necessary to establish the allelic relationships between dominant and recessive genes for resistance.