Genetic insights into brown plant hopper resistance in newly identified rice cultivars

Two brown planthopper resistant (GM-3 and GM-86) and two susceptible donors, GM-60 and GM-96 were used in hybridization program for development of brown planthopper resistant varieties. F₁ population resulting from the four crosses of all four donors showed resistance to BPH. In the F₂ population, observed the 3:1 segregated ratio in all the crosses, GM-3 × GM-60, GM-3 × GM-96, GM-86 × GM-60 and GM-86 × GM96, indicating a single dominant gene controlled the resistance. Therefore, brown planthopper resistance in GM-3 and GM-86 was under the control of single dominant gene. Resistant donors, GM-3 and GM-86, could be valuable sources for incorporating brown planthopper resistance into vulnerable and high-yielding rice cultures.