Abstract

FIORINI, Cibelle VA et al. Characterization of tomato lines originated of the interspecific cross with relationship to late blight resistance. Hortic. Bras. [online]. 2010, vol.28, n.2, pp. 197-202. ISSN 0102-0536.  http://dx.doi.org/10.1590/S0102-05362010000200010.

In this research we evaluated tomato lines for resistance to late blight. An amount of 72 genotypes (70 tomato lines F₈ plus the accesses of BGH-UFV '184'and '1497') was evaluated. The lines were derived from interspecific crossing between Solanum lycopersicum ('Santa Clara') and Solanum habrochaites f. glabratum (access BGH-UFV '6902'). The experiments were conducted in field in the randomized blocks design with two and three replications in the first and second experiment, respectively. The plants were inoculated with a sporangia blend of Phytophthora infestans from the six different tomato producing cities of Zona da Mata, Minas Gerais State, Brazil, in a concentration of 10³ sporangia mL^-1. We evaluated the percentage of disease severity, presented as an area under the disease progress curve (AUDPC). In both experiments 10 tomato lines plus the access BGH-UFV '1497' were selected. The lines identified as 50 I, 90 J, 127 F, 145 B and 164 G presented medium values of AUDPC inferior to the resistant witness. It was possible the introgression of late blight resistance genes present in S. habrochaites f. glabratum in S. lycopersicum.

Keywords : Solanum spp.; Phytophthora infestans; selection; tomato; pre-breeding.