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Molecular mapping of resistance genes to tan spot [Pyrenophora tritici-repentis race 1] in synthetic wheat lines

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Abstract

Synthetic wheat lines (2n = 6x = 42, AABBDD), which are amphiploids developed from the hybrid between tetraploid wheat (Triticum turgidum L., 2n = 4x = 28, AABB) and Aegilops tauschii Coss. (2n = 2x = 14, DD), are important sources of resistance against tan spot of wheat caused by Pyrenophora tritici-repentis. In the present study, inheritance, allelism and genetic linkage analysis in synthetic wheat lines have been carried out. Segregation analysis of the phenotypic and molecular data in F2:3 populations of CS/XX41, CS/XX45, and CS/XX110 has revealed a 1:2:1 segregation ratio indicating that resistance of tan spot in these synthetic lines is controlled by a single gene. Allelism tests detected no segregation for susceptibility among F1 and F2 plants derived from intercrosses of the resistance lines XX41, XX45 and XX110 indicating that the genes are either allelic or tightly linked. Linkage analysis using SSR markers showed that all the three genes: tsn3a in XX41, Tsn3b in XX45 and tsn3c in XX110 are clustered in the region around Xgwm2a, located on the short arm of chromosome 3D. The linked markers and genetic relationship of these genes will greatly facilitate their use in wheat breeding and deployment of cultivars resistant to tan spot.

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Acknowledgments

The first author is supported by a scholarship from the German Academic Exchange Service (DAAD), Bonn.

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Authors and Affiliations

  1. Institute of Plant Breeding, Technical University of Munich, 85350, Freising, Weihenstephan, Germany

    W. Tadesse, M. Schmolke, S. L. K. Hsam, V. Mohler, G. Wenzel & F. J. Zeller

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  1. W. Tadesse
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  2. M. Schmolke
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  3. S. L. K. Hsam
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  4. V. Mohler
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  5. G. Wenzel
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  6. F. J. Zeller
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Corresponding author

Correspondence to F. J. Zeller.

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Communicated by A. Charcosset.

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Tadesse, W., Schmolke, M., Hsam, S.L.K. et al. Molecular mapping of resistance genes to tan spot [Pyrenophora tritici-repentis race 1] in synthetic wheat lines. Theor Appl Genet 114, 855–862 (2007). https://doi.org/10.1007/s00122-006-0484-y

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  • DOI: https://doi.org/10.1007/s00122-006-0484-y

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