author(s)
Ruth Elizabeth Ekka, AK Sarawgi, RR Kanwar and Anjum Ahmad

abstract
Mode of inheritance and allelic relationships of genes conforming resistance to brown plant hopper (NILAPARVATA LUGENS STAL.) was investigated in three rice (Oryza sativa L.) genotypes viz. R1723-1413-3-357-1, R1519-773-3-581-1 and R1243-1224-578-1. Eight-ten days old seedlings were infested with first- and second-instar nymphs of brown planthopper and seedling injury was recorded 7 to 10 days after infestation. Inheritance studies revealed presence of a single dominant gene for resistance in R1723-1413-3-357-1 and R1243-1224-578-1. Allelic tests revealed that gene for brown plant hopper resistance present in R1519-773-3-581-1 was non-allelic to the genes bph5 (ARC10550), bph7 (T12), Bph1 (MTU15) and Bph6 (Swarnalata). The cross of resistant donor R1723-1413-3-357-1 with MTU15 showed no segregation for BPH resistance in the F1 and F3 generations, indicating that the genes conferring resistance are common. The dominant gene control of BPH resistance of resistant donors can be used for easy incorporation of BPH resistance into susceptible high yielding rice varieties.