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Genetics, Vol. 168, 665-676, October 2004, Copyright © 2004
doi:10.1534/genetics.104.034835

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A 2500-Locus Bin Map of Wheat Homoeologous Group 5 Provides Insights on Gene Distribution and Colinearity With Rice

A. M. Linkiewicz*,1,2, L. L. Qi{dagger},1, B. S. Gill{dagger}, A. Ratnasiri*, B. Echalier{dagger}, S. Chao{ddagger},3, G. R. Lazo§, D. D. Hummel{ddagger}, O. D. Anderson§, E. D. Akhunov*, J. Dvorák*, M. S. Pathan, H. T. Nguyen, J. H. Peng&, N. L. V. Lapitan&, Miftahudin, J. P. Gustafson**, C. M. La Rota{dagger}{dagger}, M. E. Sorrells{dagger}{dagger}, K. G. Hossain{ddagger}{ddagger}, V. Kalavacharla{ddagger}{ddagger}, S. F. Kianian{ddagger}{ddagger}, D. Sandhu§§,4, S. N. Bondareva§§, K. S. Gill§§, E. J. Conley¶¶, J. A. Anderson¶¶, R. D. Fenton&&, T. J. Close&&, P. E. McGuire{ddagger}, C. O. Qualset{ddagger} and J. Dubcovsky*,5

* Department of Agronomy and Range Science, University of California, Davis, California 95616
{dagger} Department of Plant Pathology, Wheat Genetics Resource Center, Kansas State University, Manhattan, Kansas 66506-5502
{ddagger} Genetic Resources Conservation Program, University of California, Davis, California 95616
§ USDA-ARS Western Regional Research Center, Albany, California 94710-1105
Department of Agronomy, University of Missouri, Columbia, Missouri 65211
& Department of Soil and Crop Sciences, Colorado State University, Fort Collins, Colorado 80523-1170
** USDA-ARS Plant Genetics Research Unit, Department of Agronomy, University of Missouri, Columbia, Missouri 65211
{dagger}{dagger} Department of Plant Breeding, Cornell University, Ithaca, New York 14853
{ddagger}{ddagger} Department of Plant Sciences, North Dakota State University, Fargo, North Dakota 58105
§§ Department of Crop and Soil Sciences, Washington State University, Pullman, Washington 99164-6420
¶¶ Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108
&& Department of Botany and Plant Sciences, University of California, Riverside, California 92521

5 Corresponding author: Department of Agronomy and Range Science, University of California, 1 Shields Ave., Davis, CA 95616.
E-mail: jdubcovsky{at}ucdavis.edu

We constructed high-density deletion bin maps of wheat chromosomes 5A, 5B, and 5D, including 2338 loci mapped with 1052 EST probes and 217 previously mapped loci (total 2555 loci). This information was combined to construct a consensus chromosome bin map of group 5 including 24 bins. A relatively higher number of loci were mapped on chromosome 5B (38%) compared to 5A (34%) and 5D (28%). Differences in the levels of polymorphism among the three chromosomes were partially responsible for these differences. A higher number of duplicated loci was found on chromosome 5B (42%). Three times more loci were mapped on the long arms than on the short arms, and a significantly higher number of probes, loci, and duplicated loci were mapped on the distal halves than on the proximal halves of the chromosome arms. Good overall colinearity was observed among the three homoeologous group 5 chromosomes, except for the previously known 5AL/4AL translocation and a putative small pericentric inversion in chromosome 5A. Statistically significant colinearity was observed between low-copy-number ESTs from wheat homoeologous group 5 and rice chromosomes 12 (88 ESTs), 9 (72 ESTs), and 3 (84 ESTs).




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