Identification and High-Density Mapping of Gene-Rich Regions in Chromosome Group 5 of Wheat

INVESTIGATIONS

Identification and High-Density Mapping of Gene-Rich Regions in Chromosome Group 5 of Wheat

K. S. Gill, B. S. Gill, T. R. Endo and E. V. Boyko
Wheat Genetics Resource Center and Department of Plant Pathology, Kansas State University, Manhattan, Kansas 66506

The distribution of genes and recombination in the wheat genome was studied by comparing physical maps with the genetic linkage maps. The physical maps were generated by mapping 80 DNA and two phenotypic markers on an array of 65 deletion lines for homoeologous group 5 chromosomes. The genetic maps were constructed for chromosome 5B in wheat and 5D in Triticum tauschii. No marker mapped in the proximal 20% chromosome region surrounding the centromere. More than 60% of the long arm markers were present in three major clusters that physically encompassed <18% of the arm. Because 48% of the markers were cDNA clones and the distributions of the cDNA and genomic clones were similar, the marker distribution may represent the distribution of genes. The gene clusters were identified and allocated to very small chromosome regions because of a higher number of deletions in their surrounding regions. The recombination was suppressed in the centromeric regions and mainly occurred in the gene-rich regions. The bp/cM estimates varied from 118 kb for gene-rich regions to 22 Mb for gene-poor regions. The wheat genes present in these clusters are, therefore, amenable to molecular manipulations parallel to the plants with smaller genomes like rice.

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				E. J. Conley, V. Nduati, J. L. Gonzalez-Hernandez, A. Mesfin, M. Trudeau-Spanjers, S. Chao, G. R. Lazo, D. D. Hummel, O. D. Anderson, L. L. Qi, et al. A 2600-Locus Chromosome Bin Map of Wheat Homoeologous Group 2 Reveals Interstitial Gene-Rich Islands and Colinearity With Rice Genetics, October 1, 2004; 168(2): 625 - 637. [Abstract] [Full Text] [PDF]

				A. M. Linkiewicz, L. L. Qi, B. S. Gill, A. Ratnasiri, B. Echalier, S. Chao, G. R. Lazo, D. D. Hummel, O. D. Anderson, E. D. Akhunov, et al. A 2500-Locus Bin Map of Wheat Homoeologous Group 5 Provides Insights on Gene Distribution and Colinearity With Rice Genetics, October 1, 2004; 168(2): 665 - 676. [Abstract] [Full Text] [PDF]

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				M. Dilbirligi, M. Erayman, D. Sandhu, D. Sidhu, and K. S. Gill Identification of Wheat Chromosomal Regions Containing Expressed Resistance Genes Genetics, January 1, 2004; 166(1): 461 - 481. [Abstract] [Full Text] [PDF]

				L. K. Anderson, G. G. Doyle, B. Brigham, J. Carter, K. D. Hooker, A. Lai, M. Rice, and S. M. Stack High-Resolution Crossover Maps for Each Bivalent of Zea mays Using Recombination Nodules Genetics, October 1, 2003; 165(2): 849 - 865. [Abstract] [Full Text] [PDF]

				M. E. Sorrells, M. La Rota, C. E. Bermudez-Kandianis, R. A. Greene, R. Kantety, J. D. Munkvold, Miftahudin, A. Mahmoud, X. Ma, P. J. Gustafson, et al. Comparative DNA Sequence Analysis of Wheat and Rice Genomes Genome Res., August 1, 2003; 13(8): 1818 - 1827. [Abstract] [Full Text] [PDF]

				S. Tang, A. Heesacker, V. K. Kishore, A. Fernandez, E. S. Sadik, G. Cole, and S. J. Knapp Genetic Mapping of the Or5 Gene for Resistance to Orobanche Race E in Sunflower Crop Sci., May 1, 2003; 43(3): 1021 - 1028. [Abstract] [Full Text] [PDF]

				J. D. Faris, J. P. Fellers, S. A. Brooks, and B. S. Gill A Bacterial Artificial Chromosome Contig Spanning the Major Domestication Locus Q in Wheat and Identification of a Candidate Gene Genetics, May 1, 2003; 164(1): 311 - 321. [Abstract] [Full Text] [PDF]

				E. D. Akhunov, A. W. Goodyear, S. Geng, L.-L. Qi, B. Echalier, B. S. Gill, Miftahudin, J. P. Gustafson, G. Lazo, S. Chao, et al. The Organization and Rate of Evolution of Wheat Genomes Are Correlated With Recombination Rates Along Chromosome Arms Genome Res., May 1, 2003; 13(5): 753 - 763. [Abstract] [Full Text] [PDF]