Theoretical and Applied Genetics

, Volume 114, Issue 8, pp 1427–1435 | Cite as

Identification of QTL for resistance and susceptibility to Stagonospora meliloti in autotetraploid lucerne

  • J. M. MusialEmail author
  • J. M. Mackie
  • D. J. Armour
  • H. T. T. Phan
  • S. E. Ellwood
  • K. S. Aitken
  • J. A. G. Irwin
Original Paper


In eastern Australia and California, USA, one of the major lethal fungal diseases of lucerne (Medicago sativa) is Stagonospora root and crown rot, caused by Stagonospora meliloti. Quantitative trait loci (QTL) involved in resistance and susceptibility to S. meliloti were identified in an autotetraploid lucerne backcross population of 145 individuals. Using regression analysis and interval mapping, we detected one region each on linkage groups 2, 6 and 7 that were consistently associated with disease reaction to S. meliloti in two separate experiments. The largest QTL on linkage group 7, which is associated with resistance to S. meliloti, contributed up to 17% of the phenotypic variation. The QTL located on linkage group 2, which is potentially a resistance allele in repulsion to the markers for susceptibility to S. meliloti, contributed up to 8% of the phenotypic variation. The QTL located on linkage group 6, which is associated with susceptibility to S. meliloti, contributed up to 16% of the phenotypic variation. A further two unlinked markers contributed 5 and 8% of the phenotypic variation, and were detected in only one experiment. A total of 517 simple sequence repeat (SSR) markers from Medicago truncatula were screened on the parents of the mapping population. Only 27 (6%) SSR markers were polymorphic and could be incorporated into the autotetraploid map of M. sativa. This allowed alignment of our M. sativa linkage map with published M. truncatula maps. The markers linked to the QTL we have reported will be useful for marker assisted selection for partial resistance to S. meliloti in lucerne.


Alfalfa Molecular markers QTL mapping 



The authors gratefully acknowledge the Cooperative Research Centre for Tropical Plant Protection, the Australian Research Council (LP0454871) and the Grains Research and Development Corporation for providing funding support for the project.


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • J. M. Musial
    • 1
    Email author
  • J. M. Mackie
    • 1
  • D. J. Armour
    • 1
  • H. T. T. Phan
    • 2
  • S. E. Ellwood
    • 2
  • K. S. Aitken
    • 3
  • J. A. G. Irwin
    • 1
  1. 1.School of Integrative BiologyThe University of QueenslandBrisbaneAustralia
  2. 2.Australian Centre for Necrotrophic Fungal Pathogens, State Agricultural Biotechnology Centre, Health SciencesMurdoch UniversityPerthAustralia
  3. 3.CSIRO Plant IndustryQueensland Bioscience PrecinctSt LuciaAustralia

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