Theoretical and Applied Genetics

, Volume 114, Issue 1, pp 165–175 | Cite as

Development of functional markers specific for seven Pm3 resistance alleles and their validation in the bread wheat gene pool

  • L. Tommasini
  • N. Yahiaoui
  • P. Srichumpa
  • B. Keller
Original Paper

Abstract

In the ideal case, molecular markers used for marker-assisted selection are allele-specific even if the alleles differ only by a few nucleotide polymorphisms within the coding sequence of target genes. Such ‘perfect’ markers are completely correlated with the trait of interest. In hexaploid wheat (Triticum aestivum L.) the Pm3 locus encodes seven alleles (Pm3aPm3g) conferring resistance to different races of Blumeria graminis f.sp. tritici, the agent of powdery mildew, a major disease of bread wheat. All Pm3 alleles are known at the molecular level. Here, we generated specific markers for the Pm3 alleles based on nucleotide polymorphisms of coding and adjacent non-coding regions. The specificity of these markers was validated in a collection of 93 modern or historically important cultivars and breeding lines of wheat and spelt (Triticum spelta L.). These markers confirmed the presence of the predicted Pm3 alleles in 31 varieties and lines known to carry Pm3 resistance alleles. In a few varieties, Pm3 alleles different from alleles previously described based on pathogenicity tests or tightly linked markers were observed. In all these cases, the identity of the marker-detected Pm3 alleles was confirmed by DNA sequence analysis. Pm3 markers confirmed the absence of known Pm3 resistance alleles in 54 European wheat and spelt varieties in which Pm3 alleles had not been previously identified. These results indicate that the developed markers are highly diagnostic for specific Pm3 resistance alleles in a wide range of varieties and breeding lines, and will be useful (1) for identifying Pm3 alleles in the wheat gene pool, (2) for efficient marker-assisted selection of these genes, and (3) for combining multiple Pm3 alleles within a single cultivar through transgenic approaches.

Supplementary material

122_2006_420_MOESM1_ESM.pdf (46 kb)
Supplementary material
122_2006_420_MOESM2_ESM.pdf (213 kb)
Supplementary material

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • L. Tommasini
    • 1
    • 2
  • N. Yahiaoui
    • 1
  • P. Srichumpa
    • 1
    • 3
  • B. Keller
    • 1
  1. 1.Plant Molecular Biology Department, Institute of Plant BiologyUniversity of ZürichZürichSwitzerland
  2. 2.Department of Botany and Plant SciencesUniversity of CaliforniaRiversideUSA
  3. 3.Ubon Ratchathani Rice Research CenterUbon RatchathaniThailand

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