Abstract
An F2 of an interspecific cross between cultivated tomato (Lycopersicon esculentum cv. Moneymaker) and L. hirsutum f. glabratum was used to generate an RFLP linkage map. Distortion of single locus segregation (1:2:1) was observed for a number of markers from different chromosomes, always with a prevalence for L. hirsutum f. glabratum alleles. To identify quantitative trait loci (QTLs) for greenhouse whitefly (Trialeurodes vaporariorum) resistance in this F2 population, life history components of the greenhouse whitefly population were evaluated. Two QTLs affecting oviposition rate mapped to chromosome 1 (Tv-1) and 12 (Tv-2). F3 lines homozygous for either the L. esculentum allele or the L. hirsutum f. glabratum allele at one or both loci confirmed the effects of Tv-1 and Tv-2. The F2 population was also evaluated for segregation of type IV and type VI glandular trichome densities. Two QTLs affecting trichome type IV density (TriIV-1 and TriIV-2) and one affecting type VI trichome density (TriVI-1) mapped to chromosomes 5, 9 and 1, respectively. These results do not support the hypothesis that the density of type IV trichomes is involved in whitefly resistance.
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