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Title: NEW INSIGHTS INTO THE ORGANIZATION AND EVOLUTION OF WHEAT GENOMES

Author
item DVORAK, J - UNIV OF CALIFORNIA-DAVIS
item AKHUNOV, E - UNIV OF CALIFORNIA-DAVIS
item AKHUNOV, A - UNIV OF CALIFORNIA-DAVIS
item LUO, M - UNIV OF CALIFORNIA-DAVIS
item LINKIEWICZ, A - UNIV OF CALIFORNIA-DAVIS
item DUBCOVSKY, J - UNIV OF CALIFORNIA-DAVIS
item HUMMEL, D - UNIV OF CALIFORNIA-DAVIS
item Lazo, Gerard
item Chao, Shiaoman
item Anderson, Olin
item DAVID, J - DGPC, MONTPELLIER, FRANCE
item QI, L - KANSAS STATE UNIVERSITY
item ECHALIER, B - KANSAS STATE UNIVERSITY
item GILL, B - KANSAS STATE UNIVERSITY
item MIFTAHUDIN - UNIV OF MISSOURI-COLUMBIA
item Gustafson, J
item LA ROTA, M - CORNELL UNIVERSITY
item SORRELLS, M - CORNELL UNIVERSITY
item ZHANG, D - TEXAS TECH UNIVERSITY
item NGUYEN, H - UNIV OF MISSOURI-COLUMBIA
item KALAVACHARLA, V - NORTH DAKOTA STATE UNIV
item HOSSAIN, K - NORTH DAKOTA STATE UNIV
item KIANIAN, S - NORTH DAKOTA STATE UNIV
item PENG, J - COLORADO STATE UNIVERSITY
item LAPITAN, N L - COLORADO STATE UNIVERSITY
item WENNERLIND, E - UNIVERSITY OF MINNESOTA
item NDUATI, V - UNIVERSITY OF MINNESOTA
item ANDERSON, J - UNIVERSITY OF MINNESOTA
item SIDHU, D - WASHINGTON STATE UNIV
item GILL, K - WASHINGTON STATE UNIV
item CHOI, D - UNIV OF CA-RIVERSIDE
item CLOSE, T - UNIV OF CA-RIVERSIDE
item MCGUIRE, P - UNIV OF CALIFORNIA-DAVIS
item QUALSET, C - UNIV OF CALIFORNIA-DAVIS

Submitted to: Wheat Genetics International Symposium Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 6/30/2003
Publication Date: 9/1/2003
Citation: Dvorak, J., Akhunov, E.D., Akhunov, A.R., Luo, M., Linkiewicz, A.M., Dubcovsky, J., Hummel, D., Lazo, G.R., Chao, S., Anderson, O.D., David, J., Qi, L., Echalier, B., Gill, B.S., Miftahudin, Gustafson, J.P., La Rota, M., Sorrells, M.E., Zhang, D., Nguyen, H.T., Kalavacharla, V., Hossain, K., Kianian, S.F., Peng, J., Lapitan, N.V., Wennerlind, E.J., Nduati, V., Anderson, J.A., Sidhu, D., Gill, K.S., Choi, D., Close, T.J., Mcguire, P.E., Qualset, C.O. 2003. New insights into the organization and evolution of wheat genomes. In: Proceedings of the Wheat Genetics International Symposium, September 1-6, 2003, Paestum, Italy. p. 248-253.

Interpretive Summary:

Technical Abstract: Mapping genes detected by wheat expressed sequence tags (ESTs) in hexaploid wheat and an analysis of distribution and frequencies of gene deletions in tetraploid and hexaploid wheats provided new insights into the organization of wheat genomes and suggested that recombination has played a central role in their evolution. Relative gene densities and recombination rates along wheat chromosome arms were shown to increase with the relative distance from the centromere. Single-gene loci present once in each wheat genome were located predominantly in the proximal, low-recombination regions, while multi-gene loci were more frequent in distal, high-recombinational regions. The distribution of loci that originated by duplication and transposition correlated positively with recombination rates along chromosome arms. Fixed deletions of loci that occurred in diploid ancestors of wheat were also most frequent in high recombination regions. The global effect of these trends is that the distal regions of wheat chromosome arms have been evolving faster than the proximal, low-recombination regions. This is reflected by lower synteny between homoeologous chromosomes in the distal chromosome regions than in the proximal chromosome regions. Polymorphism for deletions that occurred during the evolution of tetraploid and hexaploid wheat was higher in the distal, high-recombination region than in the proximal, low-recombination region. It is suggested that this disparity in the deletion rates leads to higher gene density in the distal chromosome regions.