Development of functional markers specific for seven Pm3 resistance alleles and their validation in the bread wheat gene pool |
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| Authors: | L. Tommasini N. Yahiaoui P. Srichumpa B. Keller |
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| Affiliation: | (1) Plant Molecular Biology Department, Institute of Plant Biology, University of Zürich, Zollikerstr. 107, 8008 Zürich, Switzerland;(2) Present address: Department of Botany and Plant Sciences, University of California, Riverside, 2150 Batchelor Hall, Riverside, CA 92521-0124, USA;(3) Present address: Ubon Ratchathani Rice Research Center, P.O. Box 65, Muang District, 34000 Ubon Ratchathani, Thailand |
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| 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 (Pm3a–Pm3g) 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.Electronic supplementary material Supplementary material is available in the online version of this article at and is accessible for authorized users. |
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