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Molecular genetic characterization of the Lr34/Yr18 slow rusting resistance gene region in wheat

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Abstract

Wheat expressed sequence tags (wESTs) were identified in a genomic interval predicted to span the Lr34/Yr18 slow rusting region on chromosome 7DS and that corresponded to genes located in the syntenic region of rice chromosome 6 (between 2.02 and 2.38 Mb). A subset of the wESTs was also used to identify corresponding bacterial artificial chromosome (BAC) clones from the diploid D genome of wheat (Aegilops tauschii). Conservation and deviation of micro-colinearity within blocks of genes were found in the D genome BACs relative to the orthologous sequences in rice. Extensive RFLP analysis using the wEST derived clones as probes on a panel of wheat genetic stocks with or without Lr34/Yr18 revealed monomorphic patterns as the norm in this region of the wheat genome. A similar pattern was observed with single nucleotide polymorphism analysis on a subset of the wEST derived clones and subclones from corresponding D genome BACs. One exception was a wEST derived clone that produced a consistent RFLP pattern that distinguished the Lr34/Yr18 genetic stocks and well-established cultivars known either to possess or lack Lr34/Yr18. Conversion of the RFLP to a codominant sequence tagged site (csLV34) revealed a bi-allelic locus, where a variant size of 79 bp insertion in an intron sequence was associated with lines or cultivars that lacked Lr34/Yr18. This association with Lr34/Yr18 was validated in wheat cultivars from diverse backgrounds. Genetic linkage between csLV34 and Lr34/Yr18 was estimated at 0.4 cM

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Acknowledgments

We are indebted to the skilled technical support provided by Libby Viccars and additional support from Sutha Chandramohan and Kylie Groom. This work was funded by the Grains Research and Development Corporation as a component project of the Australian Winter Cereal Molecular marker Program (grant no. CSP00063) to CSIRO and Project CIM13 to CIMMYT.

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Authors and Affiliations

  1. CSIRO Plant Industry, GPO Box 1600, Canberra, ACT, 2601, Australia

    E. S. Lagudah, H. McFadden & W. Spielmeyer

  2. International Maize and Wheat Improvement Center (CIMMYT), Apartado Postal 6-641, 06600, Mexico, D.F., Mexico

    R. P. Singh

  3. Campo Experimental Valle de Mexico-INIFAP, Apdo. Postal 10, 56230, Chapingo, Edo. de Mexico, Mexico

    J. Huerta-Espino

  4. Plant Breeding Institute, University of Sydney, Cobbitty, NSW, 2570, Australia

    H. S. Bariana

Authors
  1. E. S. Lagudah
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  2. H. McFadden
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  3. R. P. Singh
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  4. J. Huerta-Espino
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  5. H. S. Bariana
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  6. W. Spielmeyer
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Corresponding author

Correspondence to E. S. Lagudah.

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Communicated by Beat Keller.

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Lagudah, E.S., McFadden, H., Singh, R.P. et al. Molecular genetic characterization of the Lr34/Yr18 slow rusting resistance gene region in wheat. Theor Appl Genet 114, 21–30 (2006). https://doi.org/10.1007/s00122-006-0406-z

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  • DOI: https://doi.org/10.1007/s00122-006-0406-z

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