Genetic analysis of resistance to green leafhopper, Nephotettix virescens (Distant) in rice (Oryza sativa L.)

The genetics of resistance to green leafhopper Nephotettix virescens (Distant) in five rice (Oryza sativa L.) donors including two pre-release varieties with unknown genes for resistance viz., IET 13341 and IET 12175; three differentials with known genes viz., TAPL 796, Maddai Karuppan and Ptb 8 was studied. The donors, F₁ hybrids and F₂ populations from the crosses of donors with the susceptible variety, TN1 and inter crosses among resistant donors were screened against Indian population of green leafhopper in green house. Inheritance of resistance suggested that a single dominant gene governed resistance in IET 13341, IET 12175, TAPL 796 and Maddai Karuppan and a single recessive gene in Ptb 8. Allelic tests with known gene donors i.e., TAPL 796 and Maddai Karuppan showed that the dominant genes present in IET 13341 and IET 12175 were different and independent of G/h 6 and G/h 7 of TAPL 796 and Maddai Karuppan, respectively.