1. Genetic Mapping of a Triticum monococcum‐derived Powdery Mildew Resistance Gene in Common Wheat
- Author
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Miranda, L. M., Perugini, L., Srnić, G., Brown‐Guedira, G., Marshall, D., Leath, S., and Murphy, J. P.
- Abstract
Powdery mildew of wheat (Triticum aestivumL.) is a major fungal disease caused by Blumeria graminisDC f. sp. triticiA microsatellite linkage map was developed for the T. monococcum‐derived powdery mildew resistant gene present in the North Carolina germplasm line NCBGT96A6 (NCA6). Genetic analysis of F2‐derived lines from the cross NCA6 × ‘Saluda’ indicated a single gene controlled powdery mildew resistance. Four microsatellite markers linked to the NCA6 Pmgene mapped to chromosome 7AL. The most likely order was Xcfa2123‐0.9 cM–Xbarc121‐1.7 cM resistance gene/Xcfa2019‐3.0 cM‐Xgwm332A detached‐leaf test indicated the disease reaction response of the NCA6 Pmgene was different from the five known alleles at the Pm1locus on 7AL. Deletion interval mapping showed a large physical to genetic distance ratio for these microsatellite marker loci. This may be due to suppressed recombination between the introgressed T. monococcumsegment and the homologous region of the T. aestivumcultivar Saluda. Our results suggested that the NCA6 Pmgene is likely a novel source of resistance to powdery mildew but additional allelism studies are needed to establish the relationship between this locus and the other known Pmloci on 7AL.
- Published
- 2007
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