Wheat genome structure: translocations during the course of polyploidization |
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Authors: | Elena A Salina Irina N Leonova Tatyana T Efremova Marion S Röder |
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Institution: | (1) Institute of Cytology and Genetics, Lavrentiev ave. 10, Novosibirsk, 630090, Russia;(2) Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstrasse 3, 06466 Gatersleben, Germany |
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Abstract: | The genomic organization of Triticum timopheevii (2n=28, AtAtGG) was compared with hexaploid wheat T. aestivum (2n=42, AABBDD) by comparative mapping using microsatellites derived from bread wheat. Genetic maps for the two crosses T. timopheevii var. timopheevii × T. timopheevii var. typica and T. timopheevii K-38555×T. militinae were constructed. On the first population, 121 loci were mapped, and on the second population 103 loci. The transferability
of the wheat markers to T. timopheevii was generally better for the A genome-specific markers (76–78% produced amplification products; 26 and 29% were polymorphic)
than for B genome-specific markers (54% produced amplification products; 14 and 16% were polymorphic). Of the D genome-specific
markers, one third produced amplification products in T. timopheevii, but only 5 and 2% were polymorphic in the corresponding mapping populations. The maps constructed confirmed the previously
described translocation between chromosome arms 6AtS and 1GS and revealed at least two yet unknown rearrangements on chromosomes 4At and 6At. The presence of other translocations and rearrangements between T. timopheevii and T. aestivum was demonstrated by a variety of markers mapping to nonhomoeologous positions. |
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Keywords: | Microsatellite maps Triticum timopheevii Wheat Black glume (Bg) |
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