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doi:10.1534/genetics.106.065144
A more recent version of this article appeared on December 1, 2006.
REGULAR RESEARCH PAPERS |
Homeologous Recombination in Solanum lycopersicoides Introgression Lines of Cultivated Tomato
Michael A. Canady 1, Yuanfu Ji 1 and Roger T. Chetelat 1*
1 University of California, Davis
* To whom correspondence should be addressed. E-mail: trchetelat{at}ucdavis.edu.
Submitted on August 22, 2006
Revised on September 17, 2006
Accepted on 4 October 2006
A library of "introgression lines" containing Solanum lycopersicoides chromosome segments in the genetic background of cultivated tomato (Lycopersicon esculentum) was used to study factors affecting homeologous recombination. Recombination rates were estimated in progeny of 42 heterozygous introgressions and whole chromosome substitution lines, together representing 11 of the 12 tomato chromosomes. Recombination within homeologous segments was reduced to as little as 0-10% of expected frequencies. Relative recombination rates were positively correlated with the length of introgressed segments on the tomato map. The highest recombination (up to 40-50% of normal) was observed in long introgressions or substitution lines. Double introgression lines containing two homeologous segments on opposite chromosome arms were synthesized to increase their combined length. Recombination was higher in the double than in the single segment lines, despite a preference for crossovers in the region of homology between segments. A greater increase in homeologous recombination was obtained by crossing the S. lycopersicoides introgression lines to L. pennellii - a phylogenetically intermediate species - or to L. esculentum lines containing single L. pennellii segments on the same chromosome. Recombination rates were highest in regions of overlap between S. lycopersicoides and L. pennellii segments. The potential application of these results to breeding with introgression lines are discussed.
Key Words: Solanum lycopersicum, Solanum pennellii, alien introgression, homeologous recombination, linkage drag
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