New genes for resistance to the green leafhopper in rice

Abstract

The inheritance of resistance to the green leafhopper (Nephotettix virescens Distant) was studied in 13 cultivars of rice (Oryza sativa L.). Seedlings at the one-leaf stage were artificially infested in the greenhouse with second- and third-instar nymphs of the green leafhopper. Seedling reaction was recorded one week after infestation. A single dominant gene that is allelic to the dominant gene Glh 1 originally identified in 'Pankhari 203', conveys resistance to green leafhopper in 'Jhingasail'. The rice cultivars 'Godalki', 'Lien-tsan 50', and 'Palasithari 601', each possess a single dominant gene for resistance, located at the Glh 2 locus, originally identified in 'ASD 7'. The resistance in 'Betong', 'DNJ 97', and 'H 5' is conditioned by single dominant genes that are allelic to Glh 3 originally found in 'IR8'. Single dominant genes that are independent of Glh 1, Glh 2, and Glh 3 convey resistance to the green leafhopper in 'ASD 8 (Thuyamalli)', 'ARC 6602', 'DM 77', 'DS 1', and 'Khama 49/8'. A single recessive gene that is independent of Glh 1, Glh 2, and Glh 3 conveys resistance to the green leafhopper in 'Ptb 8 (Chuvannari Thavalakkannan)'. This recessive gene is designated glh 4. The single dominant gene conditioning resistance in ASD 8 is designated Glh 5. We do not know the allelic relationships to glh 4 and Glh 5 of the dominant genes that convey resistance to the green leafhopper in ARC 6602, DM 77, DS 1, and Khama 49/8.