Abstract
Retrotransposon-based molecular markers have been developed to study bread wheat ( Triticum aestivum) and its wild relatives. SSAP (Sequence-Specific Amplification Polymorphism) markers based on the BARE-1/ Wis-2-1A retrotransposons were assigned to T. aestivum chromosomes by scoring nullisomic-tetrasomic chromosome substitution lines. The markers are distributed among all wheat chromosomes, with the lowest proportion being assigned the D wheat genome. SSAP markers for BARE-1/ Wis-2-1A and three other wheat retrotransposons, Thv19 , Tagermina and Tar1, are broadly distributed on a wheat linkage map. Polymorphism levels associated with these four retrotransposons vary, with BARE-1/ Wis-2-1A and Thv19 both showing approximately 13% of bands polymorphic in a mapping population, Tagermina showing approximately 17% SSAP band polymorphism and Tar1 roughly 18%. This suggests that Tagermina and Tar1 have been more transpositionally active in the recent evolutionary past, and are potentially the more useful source of molecular markers in wheat. Lastly, BARE-1 / Wis-2-1A markers have also been used to characterise the genetic diversity among a set of 35 diploid and tetraploid wheat species including 26 Aegilops and 9 Triticum accessions. The SSAP-based diversity tree for Aegilops species agrees well with current classifications, though the Triticum tree shows several significant differences, which may be associated with polyploidy in this genus.
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Acknowledgements
RAQ and BMG were supported by CASE Ph. D. Research Studentships from the BBSRC. We thank Steve Reader for providing seeds, Amar Kumar for advice and help with growing plants, Andreas Meier and Simone Gauch for help and advice with Qiagen DNAeasy methodology, and David Marshall and Naeem Syed for much helpful advice on genetic map construction. This work was supported in part by Grant QLRT-2000-31502 (TEGERM) from the European Commission under the Framework V Program
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Communicated by M.-A. Grandbastien
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Queen, R.A., Gribbon, B.M., James, C. et al. Retrotransposon-based molecular markers for linkage and genetic diversity analysis in wheat. Mol Genet Genomics 271, 91–97 (2004). https://doi.org/10.1007/s00438-003-0960-x
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DOI: https://doi.org/10.1007/s00438-003-0960-x