Influencia de genes exóticos sobre la vida en estantería y el peso del fruto de tomate

fruit shelf life (sl) is an important trait in the cultivated tomato (solanum lycopersicum) that might be increased by introgressing exotic genes. however, this approach causes a reduction in fruit weight (w). the objective of this research was to analyse the inheritance patterns of both traits in an interspecific cross, in order to subsequently design the appropriate breeding strategy. plant material included cv. caimanta, accession la722 of the exotic s. pimpinellifolium, and their f1, f2, bci.1 (f1 x la722) and bci.2 (caimanta x f1) generations. the genetic parameters, degree of dominance (d/a), broad sense heritability (h2), and narrow sense heritability (h2) were estimated for sl and w, and the phenotypic (rp) and the genetic (rg) correlations among them were calculated. the d/a were -1 and -0.86, h2 were 0.35 and 0.45, and h2 were 0 and 0.52, for w and sl respectively. the rp was 0.36 (p < 0.01) and rg was - 0.86. genetic variance was generated for both fruit weight and shelf life from this interspecific tomato cross, the additive variance component being important for sl but null for w. also, a strong association among opposite gene effects was detected for both traits.