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GrainGenes Reference Report: TAG-91-618

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Reference	TAG-91-618
Title	Comparison of wheat physical maps with barley linkage maps for group 7 chromosomes
Journal	Theoretical and Applied Genetics
Year	1995
Volume	91
Pages	618-626
Author	Hohmann U Graner A Endo T Gill B Herrmann R
Abstract	Comparative genetic maps among the Triticeae or Gramineae provide the possibility for combining the genetics, mapping information and molecular-marker resources between different species Dense genetic linkage maps of wheat and barley, which have a common array of molecular markers, along with deletion-based chromosome maps of Triticum aestivum L will facilitate the construction of an integrated molecular marker-based map for the Triticeae A set of 21 cDNA and genomic DNA clones, which had previously been used to map barley chromosome 1 (7H), were used to physically map wheat chromosomes 7A, 7B and 7D A comparative map was constructed to estimate the degree of linkage conservation and synteny of chromosome segments between the group 7 chromosomes of the two species. The results reveal extensive homoeologies between these chromosomes, and the first evidence for an interstitial inversion on the short arm of a barley chromosome compared to the wheat homoeologue has been obtained. In a cytogenetically-based physical map of group 7 chromosomes that contain restriction-fragment-length polymorphic DNA (RFLP) and random amplified polymorphic DNA (RAPD) markers, the marker density in the most distal third of the chromosome arms was two-times higher than in the proximal region. The recombination rate in the distal third of each arm appears to be 8-15 times greater than in the proximal third of each arm where recombination of wheat chromosomes is suppressed.
Keyword	[ Hide all but 1 of 15 ] chromosome-maps comparative-maps comparisons gene-mapping genetic markers hordeum vulgare inversion linkage-groups loci molecular-mapping molecular-tagged-chromosome-regions random-amplified-polymorphic-dna recombination restriction fragment length polymorphism triticum aestivum

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