Reaction of Tomato (Solanum Lycopersicum) Genotypes to Tomato Leaf Curl Virus (Tlcv) and Their Combining Ability For Resistance against The Virus

Eleven diverse parents and their 24 hybrids derived through a line × tester mating fashion evaluated for reaction to tomato leaf curl virus (TLCV) and their combining ability for resistance to the virus during Rainy Season 2005 under field epiphytotic conditions at Rahuri, India. The results showed that among the parents, COMLCR-7 and H-24 were immune, COMLCR-4, 18-1-1, H-86, H-36, H-88 and COMLCR-9 were resistant and M-3-1, 87-2 and Floradade were susceptible to TLCV. While among the hybrids, M-3- 1 × COMLCR-7, M-3-1 × H-24, M-3-1 × H-36, M-3-1 × 18-1-1 and Floradade × COMLCR-7 were resistant. Combining ability studies revealed that among the lines only M-3-1 and among the testers 18-1- 1, H-36, COMLCR-7 and H-24 exhibited significant negative GCA effect for this trait. The crosses 87-2 × H-88, Floradade × COMLCR-4 and M-3-1 × H-24 were superior specific combiners for resistance to the virus. GCA and SCA variances showed the predominance of dominance gene action for reaction to TLCV.