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Originally published as Genetics Published Articles Ahead of Print on December 15, 2005.
Genetics, Vol. 172, 1893-1900, March 2006, Copyright © 2006
doi:10.1534/genetics.105.051466
Chromosome-Level Homeology in Paleopolyploid Soybean (Glycine max) Revealed Through Integration of Genetic and Chromosome Maps
Jason G. Walling*,
Randy Shoemaker
,
Nevin Young
,
Joann Mudge and
Scott Jackson*,1
* Department of Agronomy, Purdue University, West Lafayette, Indiana 47906, USDA–ARS–CICGR and Department of Agronomy, Iowa State University, Ames, Iowa 50011 and Department of Plant Pathology, University of Minnesota, Saint Paul, Minnesota 55108
1 Corresponding author: Department of Agronomy, Purdue University, 915 W. State St., West Lafayette, IN 47906.
E-mail: sjackson{at}purdue.edu
Soybean has 20 chromosome pairs that are derived from at least two rounds of genomewide duplication or polyploidy events although, cytogenetically, soybean behaves like a diploid and has disomic inheritance for most loci. Genetically anchored genomic clones were used as probes for fluorescence in situ hybridization (FISH) to determine the level of postpolyploid chromosomal rearrangements and to integrate the genetic and physical maps to (1) assign linkage groups to specific chromosomes, (2) assess chromosomal structure, and (3) determine the distribution of recombination along the length of a chromosome. FISH mapping of seven putatively gene-rich BACs from linkage group L (chromosome 19) revealed that most of the genetic map correlates to the highly euchromatic long arm and that there is extensive homeology with another chromosome pair, although colinearity of some loci does appear to be disrupted. Moreover, mapping of BACs containing high-copy sequences revealed sequestration of high-copy repeats to the pericentromeric regions of this chromosome. Taken together, these data present a model of chromosome structure in a highly duplicated but diploidized eukaryote, soybean.
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