Chalupska, Dominika , Lee, Hyo Y. , Haselkorn, Robert , Gornicki, Piotr .
Acc homoeoloci and evolution of the wheat genomes.
We have sequenced 120 kb of BAC DNA representing the Acc-1 and Acc-2 loci from the wheats: T. urartu (AA genome), Ae. tauschii (DD genome), T. dicoccoides (AABB genome) and T. aestivum (AABBDD genome). The Acc-1 and Acc-2 genes encoding plastid and cytosolic acetyl-CoA carboxylase are 14 kb in size and are located on group 2 and group 3 chromosomes, respectively. Boundaries of the genes are revealed by the homoeoloci sequence comparison. The intergenic regions flanking the Acc genes are not conserved between the A, B and D genomes. T. urartu BACs containing two Acc-2-related pseudogenes have also been sequenced. Only a few potentially active genes have been found in the sequenced Acc loci. The 2-3 million years ago divergence time calculated for the three homoeologous chromosomes based on coding and intron sequence of the Acc-1 genes agrees with results previously reported. The Acc-2 genes appear to have a different evolutionary history in different genomes of the Triticum/Aegilops species. Composition of the Acc homoeoloci suggests a recent origin of tetraploid wheat.
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1 - University of Chicago, Molecular genetics and cell biology
2 - University of Chicago, Molecular Genetics and Cell Biology, 920 East 58th Street Rm 1039, Chicago, IL, 60637, United States
Presentation Type: Plant Biology Abstract
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM