Abstract

Abstract Germplasm sources for resistance to tobacco mosaic virus-induced blotchy ripening of greenhouse tomato (Lycopersicon esculentum Mill.) were tested in hybrid combinations using a virus strain belonging to Pelham Group I. Breeding lines possessing Tm-2 or Tm-2a genes contributed high tolerance against TMV infection based on both leaf and fruit symptoms. ‘Perou 2’ (Tm-2), Ohio MR-13 (Tm-2a), and Ohio MR-12 (Tm-2a) and hybrids involving these lines were tolerant to the virus. Significant dominance for tolerance was observed in most hybrids heterozygous at the Tm-2 or Tm-2a locus. Tm-1 gene sources were not very effective in controlling blotchiness.

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