Australasian Plant Pathology

, Volume 35, Issue 6, pp 573–579 | Cite as

Genetic improvement of lucerne for anthracnose (Colletotrichum trifolii) resistance

  • J. A. G. IrwinEmail author
  • K. S. Aitken
  • J. M. Mackie
  • J. M. Musial


Anthracnose, caused by Colletotrichum trifolii, is one of the most serious diseases influencing lucerne persistence and productivity in eastern Australia. The disease is largely controlled by plant resistance; however, new pathotypes of C. trifolii have developed in Australia, seriously limiting the productive life of susceptible cultivars. This paper describes an incompletely recessive and quantitatively inherited resistance to C. trifolii identified in a clone (W116) from cv. Sequel. S1, F1, F2 and backcross populations of W116 and D (highly susceptible clone) were studied for their reaction to C. trifolii race 1. Resistance was found to be quantitatively inherited, and quantitative trait loci associated with resistance and susceptibility were identified in a backcross population (D × W116) × D using random amplified polymorphic DNA and amplified fragment length polymorphic markers. A multi-locus region on linkage group 4 was found to contribute significantly to the resistance phenotype. The application of DNA markers to allow exploitation of this quantitatively inherited resistance in lucerne breeding is discussed.

Additional keywords

AFLP alfalfa Medicago sativa QTL RAPD 


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Copyright information

© Australasian Plant Pathology Society 2006

Authors and Affiliations

  • J. A. G. Irwin
    • 1
    Email author
  • K. S. Aitken
    • 2
  • J. M. Mackie
    • 1
  • J. M. Musial
    • 1
  1. 1.Cooperative Research Centre for Tropical Plant ProtectionThe University of QueenslandBrisbaneAustralia
  2. 2.Queensland Bioscience PrecinctCSIRO Plant IndustrySt LuciaAustralia

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