Genetic analysis of resistance to green leafhopper, Nephotettix virescens (Distant), in three varieties of rice

The genetics of resistance to green leafhopper, Nephotettix virescens (Distant), in rice varieties 'IR36' and 'Maddai Karuppan' and breeding line 'IR20965-11-3-3' was studied. The reactions of F-1 hybrids, F-2 populations and F-3 lines from the crosses of test varieties with the susceptible variety 'TN1' revealed that resistance in 'IR36' and 'Maddai Karuppan' is governed by single recessive genes while resistance in 'IR20965-11-3-3' is controlled by a single dominant gene. Allele tests with the known genes for resistance to green leafhopper revealed that the recessive gene of 'IR36' is different from and inherited independently of Glh1, Glh2, Glh3, glh4, Glh5, glh8 and Glh9t. This gene is designated as glh10t. The recessive gene of 'Maddai Karuppan' and the dominant gene of 'IR20965-11-3-3' are also non-allelic to Glh1, Glh2, Glh3, glh4, Glh5 and Glh9t. Thus. the dominant gene of IR20965-11-3-3 is designated as Glh11t. The allelic relationships of the recessive gene of 'Maddai Karuppan' with glh8 and glh10t should be investigated.