Abstract

MORALES-PALACIO, María N. et al. Phenotypic and genetic characterization of four species of the Solanum genera, Lycopersicon section. cultrop [online]. 2016, vol.37, n.3, pp. 109-119. ISSN 1819-4087.  http://dx.doi.org/10.13140/RG.2.1.1666.8406.

The tomato (Solanum lycopersicum L.) is the most economically important vegetable worldwide and one of the most consumed vegetable in the world. It’s wild relatives are native of various habitats ranging from Ecuador, Peru, and Chile and have been employed to generate varieties adapted to specific biotic and abiotic factors worldwide. In order to evaluate the morphological and genetic variation in the germplasm collection at the National University of Loja (UNL) in Ecuador, four wild species were selected: Solanum pimpinellifolium, Solanum neorickii, Solanum habrochaites, Solanum lycopersicum var. cerasiforme. With the morphological variables (20 quantitative, 20 qualitative) phenotypic differences in vegetative components and related to flower and fruit were detected. Only S. habrochaites was differentiated based on these variables. The diversity and genetic structure of the species were evaluated with 17 microsatellite loci. In spite of none of the variability indexes showed statistically significant differences due to the large variance presented, the species S. neorickii exhibited the lowest genetic variability values. The individual genetic distances, the number of groups genetically structured and the genetic differentiation (F_ST) were congruent and revealed four groups corresponding to each species tested

Keywords : germplasm bank; Ecuador; microsatellites; tomato; genetic variation.

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