Detection of tomato leaf curl virus resistance and inheritance in tomato (Solanum lycopersicum L.)

Tomato leaf curl virus (TLCV) is amajor viral disease in tomato that causes quantitative and qualitative losses to the crop. One hundred and fifty three tomato genotypes were screened for three consecutive years (2006-09) under glasshouse and field conditions for TLCV resistance. The incidence of disease was higher during the Rabi season as compared to the Kharif season trials. The reactions of different genotypes were studied by artificial inoculation. Based on the coefficient of infection, nine genotypes (viz. EC-520049 (Solanum chmielewskii), EC-520058, EC-520060 and EC-520061 (S. habrochaites), EC-520070, EC-520071, EC-520077, EC-520079 (S. pimpinellifolium) and H-88-78-1(S. lycopersicum; a derivative of S. habrochaites f. glabratum) were found to be highly resistant in both environments. H-88-78-1 was used for inheritance studies during 2008-10. Using F-2 Mendelian segregation, populations showed a 3 (resistant): 1 (susceptible) ratio for TLCV disease and were proposed to have both additive and dominant non-allelic gene interactions for various traits.