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Progress in breeding tomatoes for resistance to tomato spotted wilt

Wilson R. Maluf; Masao Toma-Braghini; Reinaldo D. Corte

Escola Superior de Agricultura de Lavras, Departamento de Agricultura, Caixa Postal 37, 37200 Lavras, MG, Brasil

ABSTRACT

Among 32 Lycopersicon spp. accessions field tested for tomato spotted wilt virus (TSWV) resistance in the summer season of 1985/86 in Paulinia county, five were found to be resistant to this viral disease: L. peruvianum ";LA-444-1";, L. hirsutum ";PI 127826";, L. hirsutum var. globratum ";PI 134417";, L. pimpenellifoium "PI 732293-2V" and L. esculentum "Rey de Los Tempranos". Segregating populations and/or breeding lines created from crosses between susceptible commercial tomato cultivars and TSWV resistant Lycopersicon spp. accessions were evaluated in a series of experiments performed from 1986 through 1989. These populations and breeding lines trace back to crosses with "Rey de Los Tempranos", "PI 732293-2V", "PI 127826" and "PI 134417". Emphasis was placed on populations originated from crosses with "Rey de Los Tempranos", the soleL. esculentum accession with TSWV resistance. In 1988, we selected five stable advanced breeding lines with both TSWV resistance and superior horticultural traits (comparable to the standard tomato cultivar Angela Gigante I-5100). In 1989, the superior performance of these resistant lines was confirmed in a replicated trial. Data indicate that resistance to TSWV found in "Rey de Los Tempranos" is controlled by recessive allele(s).

Keywords: Tomatoes; Spotted wilt.

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