title: Characterization of a New Pm2 Allele Conferring Powdery Mildew Resistance in the Wheat Germplasm Line FG-1.
abstract: Powdery mildew has a negative impact on wheat production. Novel host resistance increases the diversity of resistance genes and helps to control the disease. In this study, wheat line FG-1 imported from France showed a high level of powdery mildew resistance at both the seedling and adult stages. An F2 population and F2:3 families from the cross FG-1 × Mingxian 169 both fit Mendelian ratios for a single dominant resistance gene when tested against multiple avirulent Blumeria tritici f. sp. tritici (Bgt) races. This gene was temporarily designated PmFG. PmFG was mapped on the multi-allelic Pm2 locus of chromosome 5DS using seven SSR, 10 single nucleotide polymorphism (SNP)-derived and two SCAR markers with the flanking markers Xbwm21/Xcfd81/Xscar112 (distal) and Xbwm25 (proximal) at 0.3 and 0.5 cM being the closest. Marker SCAR203 co-segregated with PmFG. Allelism tests between PmFG and documented Pm2 alleles confirmed that PmFG was allelic with Pm2. Line FG-1 produced a significantly different reaction pattern compared to other lines with genes at or near Pm2 when tested against 49 Bgt isolates. The PmFG-linked marker alleles detected by the SNP-derived markers revealed significant variation between FG-1 and other lines with genes at or near Pm2. It was concluded that PmFG is a new allele at the Pm2 locus. Data from seven closely linked markers tested on 31 wheat cultivars indicated opportunities for marker-assisted pyramiding of this gene with other genes for powdery mildew resistance and additional traits.
authors.affiliation: Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology - Chinese Academy of Sciences Shijiazhuang, China.
authors.forename: Pengtao
authors.initials: P
authors.lastname: Ma
authors.affiliation: Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology - Chinese Academy of Sciences Shijiazhuang, China.
authors.forename: Hongxng
authors.initials: H
authors.lastname: Xu
authors.affiliation: The National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science - Chinese Academy of Agricultural Sciences Beijing, China.
authors.forename: Lihui
authors.initials: L
authors.lastname: Li
authors.affiliation: Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology - Chinese Academy of Sciences Shijiazhuang, China.
authors.forename: Hongxia
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology - Chinese Academy of Sciences Shijiazhuang, China.
authors.forename: Guohao
authors.initials: G
authors.lastname: Han
authors.affiliation: Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology - Chinese Academy of Sciences Shijiazhuang, China.
authors.forename: Yunfeng
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Shijiazhuang Academy of Agricultural and Forestry Sciences Shijiazhuang, China.
authors.forename: Xiaoyi
authors.initials: X
authors.lastname: Fu
authors.affiliation: Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology - Chinese Academy of Sciences Shijiazhuang, China.
authors.forename: Xiaotian
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology - Chinese Academy of Sciences Shijiazhuang, China.
authors.forename: Diaoguo
authors.initials: D
authors.lastname: An
keywords: Blumeria graminis; MAS; Pm2 locus; Triticum aestivum; allelic variation