MAPPING OF QTLS FOR GLANDULAR TRICHOME DENSITIES AND TRIALEURODES-VAPORARIORUM (GREENHOUSE-WHITEFLY) RESISTANCE IN AN F2 FROM LYCOPERSICON-ESCULENTUM X LYCOPERSICON-HIRSUTUM F-GLABRATUM

An F-2 Of an interspecific cross between cultivated tomato (Lycopersic on esculentum cv. Money-maker) and L. hirsutum f. glabratum was used t o generate an RFLP linkage map. Distortion of single locus segregation (1:2:1) was observed for a number of markers from different chromosom es, always with a prevalence for L. hirsutum f. glabratum alleles. To identify quantitative trait loci (QTLs) for greenhouse whitefly (Trial eurodes vaporariorum) resistance in this F-2 population, life history components of the greenhouse whitefly population were evaluated. Two Q TLs affecting oviposition rate mapped to chromosome 1 (Tv-1) and 12 (T v-2). F-3 lines homozygous for either the L. esculentum allele or the L. hirsutum f. glabratum allele at one or both loci confirmed the effe cts of Tv-1 and Tv-2. The F-2 population was also evaluated for segreg ation of type IV and type VI glandular trichome densities. Two QTLs af fecting trichome type IV density (TriIV-1 and TriIV-2) and one affecti ng type VI trichome density (TriVI-1) mapped to chromosomes 5, 9 and 1 , respectively. These results do not support the hypothesis that the d ensity of type IV trichomes is involved in whitefly resistance.