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Synteny perturbations between wheat homoeologous chromosomes caused by locus duplications and deletions correlate with recombination rates. 2003
Eduard D Akhunov, and
Alina R Akhunova, and
Anna M Linkiewicz, and
Jorge Dubcovsky, and
David Hummel, and
Gerry Lazo, and
Shiaoman Chao, and
Olin D Anderson, and
Jacques David, and
Lili Qi, and
Benjamin Echalier, and
Bikram S Gill, and
Miftahudin, and
J Perry Gustafson, and
Mauricio La Rota, and
Mark E Sorrells, and
Deshui Zhang, and
Henry T Nguyen, and
Venugopal Kalavacharla, and
Khwaja Hossain, and
Shahryar F Kianian, and
Junhua Peng, and
Nora L V Lapitan, and
Emily J Wennerlind, and
Vivienne Nduati, and
James A Anderson, and
Deepak Sidhu, and
Kulvinder S Gill, and
Patrick E McGuire, and
Calvin O Qualset, and
Jan Dvorak
Department of Agronomy and Range Science, University of California, Davis, CA 95616, USA.
Loci detected by Southern blot hybridization of 3,977 expressed sequence tag unigenes were mapped into 159 chromosome bins delineated by breakpoints of a series of overlapping deletions. These data were used to assess synteny levels along homoeologous chromosomes of the wheat A, B, and D genomes, in relation to both bin position on the centromere-telomere axis and the gradient of recombination rates along chromosome arms. Synteny level decreased with the distance of a chromosome region from the centromere. It also decreased with an increase in recombination rates along the average chromosome arm. There were twice as many unique loci in the B genome than in the A and D genomes, and synteny levels between the B genome chromosomes and the A and D genome homoeologues were lower than those between the A and D genome homoeologues. These differences among the wheat genomes were attributed to differences in the mating systems of wheat diploid ancestors. Synteny perturbations were characterized in 31 paralogous sets of loci with perturbed synteny. Both insertions and deletions of loci were detected and both preferentially occurred in high recombination regions of chromosomes.
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