Genome Mapping in Capsicum and the Evolution of Genome Structure in the Solanaceae

Corresponding author: Molly Kyle Jahn, Department of Plant Breeding, 252 Emerson Hall, Cornell University, Ithaca, NY 14853., mmk9{at}cornell.edu (E-mail)

Communicating editor: J. A. BIRCHLER

We have created a genetic map of Capsicum (pepper) from an interspecific F₂ population consisting of 11 large (76.2–192.3 cM) and 2 small (19.1 and 12.5 cM) linkage groups that cover a total of 1245.7 cM. Many of the markers are tomato probes that were chosen to cover the tomato genome, allowing comparison of this pepper map to the genetic map of tomato. Hybridization of all tomato-derived probes included in this study to positions throughout the pepper map suggests that no major losses have occurred during the divergence of these genomes. Comparison of the pepper and tomato genetic maps showed that 18 homeologous linkage blocks cover 98.1% of the tomato genome and 95.0% of the pepper genome. Through these maps and the potato map, we determined the number and types of rearrangements that differentiate these species and reconstructed a hypothetical progenitor genome. We conclude there have been 30 breaks as part of 5 translocations, 10 paracentric inversions, 2 pericentric inversions, and 4 disassociations or associations of genomic regions that differentiate tomato, potato, and pepper, as well as an additional reciprocal translocation, nonreciprocal translocation, and a duplication or deletion that differentiate the two pepper mapping parents.

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