Genetic Characterization of Wheat Germplasm with Resistance to Fusarium Head Blight (FHB) and Powdery Mildew
A dominant powdery mildew resistance gene transferred to the hexaploid germplasm line NC99BGTAG11 from T. timopheevii subsp. armeniacum was mapped distally on the long arm of chromosome 7A. Differential reactions were observed between the resistance gene in NC99BGTAG11, the resistance gene in NC96BGTA4, and the alleles of the Pm1 locus that are also located on chromosome arm 7AL. Observed segregation in F2:3 lines from the cross NC99BGTAG11 x Axminster (Pm1a) and from the cross NC99BGTAG11 x NC96BGTA4 demonstrate that germplasm line NC99BGTAG11 carries a novel powdery mildew resistance gene, which is now designated as Pm37. Analyses of the population with molecular markers indicate that Pm37 is located 16 cM proximal to the Pm1 complex. However, further identification of linked markers is necessary to resolve the location of the resistance gene in NC96BGTA4. Simple sequence repeat (SSR) markers Xgwm332 and Xwmc790 were located 0.5 cM proximal and distal, respectively, to Pm37. Two new EST-derived STS markers were located distal to Pm37 and one marker was closely linked to the Pm1a region.
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Breeding for wheat resistance to fungal diseases
MarkerAssisted Selection MAS
Pm37 a new broadly effective powdery mildew resistance gene
Materials and methods
Haplotype structure and genetic diversity at Fusarium head blight
Materials and methods
3BSc Aegilops speltoides alleles alleles linked analysis Axminster Blumeria graminis bread wheat breeding lines breeding programs Buerstmayr cells indicate centromere Chinese chromosome chromosome 7A common wheat conidia Crop Sci disease distal evaluated expressed sequence tag FHB resistance QTL Fusarium graminearum Fusarium head blight genetic maps genome haplotype head blight resistance Huang identified introgressed located on chromosome loci mapping population markers linked microsatellite mildew resistance gene moderately resistant molecular markers NCA4 OH native pedigrees Phytopathology Pioneer Plant Breeding Pm1 locus Pm1a polymorphism powdery mildew resistance primer QTL intervals quantitative trait loci recombination red winter wheat resistance in wheat resistance to Fusarium resistance to powdery RFLP markers rice Röder Saluda sequences Shaner soft red winter sources of FHB species SSR markers STS markers Sumai 3 alleles susceptible Table Theor Appl Genet timopheevii tritici Triticum aestivum wheat cultivars wheat entries wheat germplasm wheat Triticum aestivum winter wheat Wuhan