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Mapping of the root lesion nematode (Pratylenchus neglectus) resistance gene Rlnn1 in wheat

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Abstract.

The root lesion nematode, Pratylenchus neglectus, is an economically damaging pathogen of wheat and other crops. The development of P. neglectus-resistant wheat cultivars would be greatly accelerated through the use of molecular markers, as resistance phenotyping is extremely time-consuming. A greenhouse bioassay was developed to identify resistance phenotypes of doubled-haploid populations. Bulked-segregant analysis was used to identify AFLP markers linked to P. neglectus resistance in the wheat cultivar Excalibur. One resistance-linked AFLP marker was mapped close to chromosome 7A RFLP markers in a densely-mapped Cranbrook/Halberd population. One of the chromosome 7A RFLP probes, cdo347, was genotyped in the Tammin/Excalibur population segregating for response to root lesion nematode and showed 8% recombination with the P. neglectus resistance gene Rlnn1. The marker Xcdo347-7A was validated on Excalibur-and Krichauff-derived DH populations segregating for Rlnn1 and showed 14% and 10% recombination, respectively, with Rlnn1 in these populations.

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Authors and Affiliations

  1. Cooperative Research Centre for Molecular Plant Breeding, South Australian Research and Development Institute, P.O. Box 397, South Australia 5001, Australia, , , , ,

    K. Williams,  S. Taylor,  P. Bogacki &  H. Wallwork

  2. Department of Plant Science, University of Adelaide, Urrbrae, South Australia 5064, Australia, , , , ,

    M. Pallotta

  3. The University of Sydney Plant Breeding Institute-Cobbitty, PMB11, New South Wales 2570, Australia, , , , ,

    H. Bariana

Authors
  1. K. Williams
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  2. S. Taylor
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  3. P. Bogacki
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  4. M. Pallotta
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  5. H. Bariana
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  6. H. Wallwork
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Williams, .K., Taylor, .S., Bogacki, .P. et al. Mapping of the root lesion nematode (Pratylenchus neglectus) resistance gene Rlnn1 in wheat. Theor Appl Genet 104, 874–879 (2002). https://doi.org/10.1007/s00122-001-0839-3

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  • DOI: https://doi.org/10.1007/s00122-001-0839-3

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