GrainGenes Reference Report: TAG-91-282
Reference
TAG-91-282
Title
Structural evolution of wheat chromosomes 4A, 5A, and 7B and its impact on recombination
Journal
Theoretical and Applied Genetics
Year
1995
Volume
91
Pages
282-288
Author
Devos K Dubcovsky J Dvorak J Chinoy C Gale M
Abstract
The construction of comparative genetic maps of chromosomes 4Am and 5Am of Triticum monococcum and chromosomes of homoeologous groups 4, 5 and 7 of T aestivum has provided insight into the evolution of these chromosomes The structures of chromosomes 4A, 5A and 7B of modern-day hexaploid bread wheat can be explained by a 4AL/5AL translocation that occurred at the diploid level and is present both in T monococcum and T. aestivum. Three further rearrangements, a 4AL/7BS translocation, a pericentric inversion and a paracentric inversion, have taken place in the tetraploid progenitor of hexaploid wheat. These structural rearrangements and the evolution of chromosomes 4A, 5A and 7B of bread wheat are discussed. The presence of the 4AL/5AL translocation in several Triticeae genomes raises two questions--which state is the more primitive, and is the translocation of mono- or poly-phylogenetic origin? The rearrangements that have occurred in chromosome 4A resulted in segments of both arms having different positions relative to the telomere, compared to 4Am and to 4B and 4D. Comparisons of map length in these regions indicate that genetic length is a function of distance from the telomere, with the distal regions showing the highest recombination.
Probe
PSR59 PSR921 PSB37
Keyword
GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.
GrainGenes Reference Report: TAG-91-282
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GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture. | |||