Powdery mildew resistance gene Pm22 in cultivar Virest is a member of the complex Pm1 locus in common wheat (Triticum aestivum L. em Thell.)

Abstract

The powdery mildew resistance gene Pm22, identified in the Italian wheat cultivar Virest and originally assigned to wheat chromosome 1D, was mapped to chromosome 7A with the aid of molecular markers. Mapping of common AFLP and SSR markers in two wheat crosses segregating for Pm22 and Pm1c, respectively, indicated that Pm22 is a member of the complex Pm1 locus. Pm22 also showed a pattern of resistance reaction to a differential set of Blumeria graminis f. sp. tritici isolates that was distinguishable from those from other Pm1 alleles in lines Axminster/8*Cc ( Pm1a), MocZlatka ( Pm1b), Weihenstephan Stamm M1N ( Pm1c) and Triticum spelta var. duhamelianum TRI 2258 ( Pm1d). Based on these results, the gene symbol Pm1e is proposed for the powdery mildew resistance gene in cv. Virest.

Estimation of genetic parameters and prediction of breeding values for apple fruit-quality traits using pedigreed plant material in Europe

“…On chromosome 7A, as discussed previously, one of the QTL detected in the RIL population could correspond to the QTL detected near the marker Xgwm344 in the F 2:3 mapping population by Chantret et al (2001). Two alleles of Pm1, namely Pm1c and Pm1e, have been mapped near this marker by Singrün et al (2003), while two powdery mildew resistance genes from einkorn (Triticum monococcum) have also been mapped in this region (Yao et al 2007). …”

High-density mapping and marker development for the powdery mildew resistance gene PmAS846 derived from wild emmer wheat (Triticum turgidum var. dicoccoides)

“…Clusters of genes conferring resistance to wheat diseases on wheat chromosomes are not randomly distributed ). Genes within a cluster can be allelic or closely linked, for example, the powdery mildew resistance genes at the Pm1 (Singrün et al 2003) and Pm3 loci (Srichumpa et al 2005).…”

“…Breeding for resistance is the most profitable and environmentally acceptable strategy to control powdery mildew. More than 60 powdery mildew resistance genes located at 41 loci (Pm1-Pm45, Pm18 = Pm1c, Pm22 = Pm1e, Pm23 = Pm4c, Pm31 = Pm21) (Ma et al 2011;Hsam et al 1998;Singrün et al 2003;Hao et al 2008;Xie et al 2011) have been identified and designated in wheat and its wild relatives.…”

Chromosomal location of genes for resistance to powdery mildew in common wheat (Triticum aestivum L. em Thell.). 9. Gene MlZec1 from the Triticum dicoccoides-derived wheat line Zecoi-1

“…To date, 32 major resistance genes to powdery mildew (Pm1-Pm32) have been reported in wheat (Hsam & Zeller, 2002;Hsam et al, 2003;Xie et al, 2003). However, due to allelism of Pm17, Pm18 and Pm22 to already documented genes, they map to 29 loci (Hsam & Zeller, 2002;Singrün et al, 2003). Very recently, Yahiaoui et al (2004) were the first to clone a powdery mildew resistance gene (Pm3b) from hexaploid wheat supported by the genome sequence information of wheat species with lower ploidy levels.…”

“…amplified fragment length polymorphism (AFLP; Vos et al, 1995), and Chinese Spring (CS) wheat -for which aneuploid stocks are available -as a parent in developing progeny used in bulked segregant analyis (Michelmore et al, 1991) has greatly expedited the mapping of resistance genes. Recently, the wheat powdery mildew resistance genes Pm24 (Huang et al, 2000b), Pm1e (Pm22) (Singrün et al, 2003) and mlRD30 (Singrün et al, 2004) were allocated to specific genomic regions by means of nullitetrasomic mapping of linked repulsion phase AFLP markers and chromosome-specific microsatellite typing. In the present study, we have used this strategy for the genetic and breakpoint interval (bin) mapping of a novel powdery mildew resistance gene from the T. dicoccoides-derived line Zecoi-1.…”