Abstract

SOBREIRA, Fábio Moreira et al. Genotypic relationships between components of postharvest resistance of Cherry and Salad tomato. Acta Agron. [online]. 2009, vol.58, n.3, pp.126-132. ISSN 0120-2812.

This study aimed to evaluate the need for individual path analysis to Cherry (L. esculentum var. cerasiforme) and Salad (L. esculentum) tomatoes type, seeking information about which variables are associated with post-harvest resistance (PHR), and guide the selection of material for breeding programs. We performed the variance analysis, genotypic correlations, multicolinearity diagnosis, and the display of genotypic correlations through path analysis. The more explicatory variables of PHR in Salad tomatoes type were the peduncle scar diameter (PSD) and the fruit mean diameter (FMD); the mesocarp thickness (MST) and fruit mean weight (FMW) in cherry type. For Cherry tomatoes, gains can be obtained in the PHR through indirect selection by MST. This will be greatest if among the fruits with more MST are selected that with lower FMW. In the case of Salad, it must indirectly select the fruits with lower PSD and among these, the fruits with the most FMD. The path analysis should be done considering each type of tomato, since the explicatory variables differ between them.

Keywords : Genetic correlation; genetic breeding; multicollinearity; Lycopersicon esculentum; Lycopersicon esculentum var. cerasiforme.

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