Abstract

RESTREPO S., Edwin F.; VALLEJO C., Franco A.  and  LOBO A., Mario. Evaluation of segregating populations from crosses between cultivated tomato and PI134418 wild accession of Solanum habrochaites var. glabratum with resistance to the fruit borer.. Acta Agron. [online]. 2008, vol.57, n.1, pp.1-8. ISSN 0120-2812.

Evaluation of segregating populations from crosses between cultivated tomato S. lycopersicum L. cv. maravilla and PI134418 wild accession of Solanum habrochaites var. glabratum with resistance to the fruit borer N. elegantalis was made. There was dominance of alleles that decrease the expression of the character mean fruit weight. The backcrossing method was more efficient than selfing in order to counteract the dominance of alleles that encode by small fruit size. The thrichomes and the mean number of fruit per bunch did not produce any effect on the fruit attack by the fruit borer; while that mean fruit weight had important effect on this attack, therefore, the insect tends to produce more damage with the increasing in the mean fruit weight. The RC₁ and RC₂ populations showed segregating typical behavior for evaluated characters, presenting high variability in all of them. The backcrossing method was effective to break the negative association between mean fruit weight and the resistance to the insect. The mean fruit weight in the RC₂ recombinant was between 45.1 and 68.6 g and showed resistance to the fruit borer.

Keywords : Solanum lycopersicum; Neoleucinodes elegantalis; selfing, thrichomes; dominance.

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