Genetic diversity and population structure in the tomato-like nightshades Solanum lycopersicoides and S. sitiensReport as inadecuate




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† Background and Aims Two closely related, wild tomato-like nightshade species, Solanum lycopersicoides andSolanum sitiens, inhabit a small area within the Atacama Desert region of Peru and Chile. Each species possessesunique traits, including abiotic and biotic stress tolerances, and can be hybridized with cultivated tomato.Conservation and utilization of these tomato relatives would benefit from an understanding of genetic diversityand relationships within and between populations.† Methods Levels of genetic diversity and population genetic structure were investigated by genotyping representativeaccessions of each species with a set of simple sequence repeat SSR and allozyme markers.† Key Results As expected for self-incompatible species, populations of S. lycopersicoides and S. sitiens wererelatively diverse, but contained less diversity than the wild tomato Solanum chilense, a related allogamousspecies native to this region. Populations of S. lycopersicoides were slightly more diverse than populations ofS. sitiens according to SSRs, but the opposite trend was found with allozymes. A higher coefficient of inbreedingwas noted in S. sitiens. A pattern of isolation by distance was evident in both species, consistent with the highlyfragmented nature of the populations in situ. The populations of each taxon showed strong geographical structure,with evidence for three major groups, corresponding to the northern, central and southern elements of theirrespective distributions.†Conclusions This information should be useful for optimizing regeneration strategies, for sampling of the populationsfor genes of interest, and for guiding future in situ conservation efforts.



Author: Albrecht, Elena; - Escobar, Miguel; - Chetelat, Roger T.; -

Source: http://repositorio.uchile.cl/



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