Genetic parameters of resistance components to Xanthomonas spp. in tomato

This study aimed to estimate genetic parameters of tomato for reaction to bacterial spot in six parents andfifteen hybrids to identify resistant genotypes and indicate breeding programs for satisfactory genetic gains. The genotypeswere evaluated in a complete randomized block design with three replications and six plants per plot in a greenhouse. Theresistance to bacterial spot was evaluated on three bases: on a grade scale (GS), based on the area under the diseaseprogresscurve (AUDPC) and on the incubation period (IPR) of the races T1, T2 and T3, at 103 CFU mL-1. UENF 157 wasresistant to races T1, T2 and T3 and UENF 158 to race T2. The bulk method can be recommended for better results inrecombined inbred lines for T1-resistance, while the pedigree method is proposed for T2 and T3.