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Genetics, Vol. 168, 687-699, October 2004, Copyright © 2004
doi:10.1534/genetics.104.034850

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A Chromosome Bin Map of 2148 Expressed Sequence Tag Loci of Wheat Homoeologous Group 7

K. G. Hossain*, V. Kalavacharla*, G. R. Lazo{dagger}, J. Hegstad*, M. J. Wentz*, P. M. A. Kianian*, K. Simons*, S. Gehlhar*, J. L. Rust*, R. R. Syamala*, K. Obeori*, S. Bhamidimarri*, P. Karunadharma*, S. Chao{ddagger},1, O. D. Anderson{dagger}, L. L. Qi§, B. Echalier§, B. S. Gill§, A. M. Linkiewicz,2, A. Ratnasiri, J. Dubcovsky, E. D. Akhunov, J. Dvorák, Miftahudin&, K. Ross**, J. P. Gustafson**, H. S. Radhawa{dagger}{dagger}, M. Dilbirligi{dagger}{dagger}, K. S. Gill{dagger}{dagger}, J. H. Peng{ddagger}{ddagger}, N. L. V. Lapitan{ddagger}{ddagger}, R. A. Greene§§, C. E. Bermudez-Kandianis§§, M. E. Sorrells§§, O. Feril&, M. S. Pathan&, H. T. Nguyen&, J. L. Gonzalez-Hernandez¶¶,3, E. J. Conley¶¶, J. A. Anderson¶¶, D. W. Choi&&, D. Fenton&&, T. J. Close&&, P. E. McGuire{ddagger}, C. O. Qualset{ddagger} and S. F. Kianian*,4

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

4 Corresponding author: Department of Plant Sciences, North Dakota State University, Fargo, ND 58105.
E-mail s.kianian{at}ndsu.nodak.edu

The objectives of this study were to develop a high-density chromosome bin map of homoeologous group 7 in hexaploid wheat (Triticum aestivum L.), to identify gene distribution in these chromosomes, and to perform comparative studies of wheat with rice and barley. We mapped 2148 loci from 919 EST clones onto group 7 chromosomes of wheat. In the majority of cases the numbers of loci were significantly lower in the centromeric regions and tended to increase in the distal regions. The level of duplicated loci in this group was 24% with most of these loci being localized toward the distal regions. One hundred nineteen EST probes that hybridized to three fragments and mapped to the three group 7 chromosomes were designated landmark probes and were used to construct a consensus homoeologous group 7 map. An additional 49 probes that mapped to 7AS, 7DS, and the ancestral translocated segment involving 7BS also were designated landmarks. Landmark probe orders and comparative maps of wheat, rice, and barley were produced on the basis of corresponding rice BAC/PAC and genetic markers that mapped on chromosomes 6 and 8 of rice. Identification of landmark ESTs and development of consensus maps may provide a framework of conserved coding regions predating the evolution of wheat genomes.




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