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Powdery mildew (PM) is a very destructive disease of wheat ( Triticum aestivum  L.). Wheat- Thinopyrum ponticum  introgression line CH7086 was shown to possess powdery mildew resistance possibly originating from  Th. ponticum . Genomic  in situ  hybridization and molecular characterization of the alien introgression failed to identify alien chromatin. To study the genetics of resistance, CH7086 was crossed with susceptible genotypes. Segregation in F 2  populations and F 2:3  lines tested with Chinese  Bgt  race E09 under controlled conditions indicated that CH7086 carries a single dominant gene for powdery mildew resistance. Fourteen SSR and EST-PCR markers linked with the locus were identified. The genetic distances between the locus and the two flanking markers were 1.5 and 3.2 cM, respectively. Based on the locations of the markers by nullisomic-tetrasomic and deletion lines of ‘Chinese Spring’, the resistance gene was located in deletion bin 2BL-0.89-1.00. Conserved orthologous marker analysis indicated that the genomic region flanking the resistance gene has a high level of collinearity to that of rice chromosome 4 and  Brachypodium  chromosome 5. Both resistance specificities and tests of allelism suggested the resistance gene in CH7086 was different from previously reported powdery mildew resistance genes on 2BL, and the gene was provisionally designated  PmCH86 . Molecular analysis of  PmCH86  compared with other genes for resistance to  Bgt  in the 2BL-0.89-1.00 region suggested that  PmCH86  may be a new PM resistance gene, and it was therefore designated as  Pm51 . The closely linked flanking markers could be useful in exploiting this putative wheat- Thinopyrum  translocation line for rapid transfer of  Pm51  to wheat breeding programs.

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Chromosomal Location and Comparative Genomics Analysis of Powdery Mildew Resistance Gene Pm51 in a Putative Wheat-Thinopyrum ponticum Introgression Line