| Abstract Detail
Solanum Taxonomy - Morning Prohens, J. [1], Anderson, Gregory J. [2], Blanca, J.M. [1], Cañizares, J. [1], Zuriaga, E. [1], Nuez, F. [1]. Molecular data and the relationships and origin of the Andean domesticate, Solanum muricatum. DURING the last 40 years, Solanum section Basarthrum has been the subject of several studies of systematics, that have revealed a complex pattern of relationships among the different species. Because this section also contains a domesticate, the pepino (Solanum muricatum), the origin and domestication of the cultigen are also of interest. We have addressed these issues using two complementary sets of molecular data (AFLPs and the DNA sequence of the MCC gene) utilizing 35 accessions of the wild species and 27 of the pepino. This study revealed a high genetic diversity within the section, with 298 polymorphic AFLP bands and 29 DNA sequence haplotypes. The results confirmed previous taxonomic classifications, allowed the distinction of morphologically similar species, and supported the evidence from morphological data for the recognition of two new species (S. catilliflorum and S. perlongystilum) from materials recently collected in central Peru. Given that DNA haplotypes for the MCC gene are species-specific, they are a useful tool in unambiguously assigning individuals or accessions to species. Results showed that the pepino is closely related to members of series Caripensia and that it is a highly variable species containing around two thirds of the AFLP variation present in the wild materials. The pepino is represented by seven different DNA haplotypes (the same number as in the widespread wild species, S. caripense), some of which can be traced to associated wild species. Other unique haplotypes not found in the wild species could be the result of recombination events between DNA haplotypes present in wild materials. Results suggest that pepino could be a polyphyletic species, that it has undergone frequent introgression from wild materials during its evolution, or, most likely, both. Analysis of the geographical distribution of the genetic diversity shows that Ecuador-southern Colombia represents the primary center of diversity for pepino.
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1 - Universidad Politécnica de Valencia, Instituto de Conservación y Mejora de la Agrodiversidad Valenciana, Camino de Vera 14, Valencia, Valencia, 46022, Spain
2 - University of Connecticut, Ecology and Evolutionary Biology, 75 North Eagleville Rd., Unit 3043, Storrs, CT, 06269-3043, USA
Keywords:
Solanum muricatum
Crop evolution
pepino
DNA sequence
MCC gene
AFLP.
Session: Poster-72
Location: Ballroom CD/Monona Terrace
Date: Tuesday, July 25th, 2006
Time: 8:00 AM
Abstract ID:156 |
