Validation of Molecular Markers for New Stem Rust Resistance Genes in U.S. Hard Winter Wheat

• DOI: 10.2135/cropsci2012.07.0446
• Publication Date: 2013-03-08T18:24:27Z
• Authors: Amy N. Bernardo; Robert L. Bowden; Matthew N. Rouse; Maria S. Newcomb; David S. Marshall; Guihua Bai
• Keywords: Stem rust; Introgression; Puccinia; Molecular marker; Marker-Assisted Selection; Common wheat

ABSTRACT Stem rust, caused by Puccinia graminis f. sp. tritici (Pgt), is one of the most serious diseases wheat ( Triticum aestivum L.) worldwide. The discovery new Pgt races in Africa, Ug99 and its variants, brings a threat to global production. Pyramiding several stem rust resistance genes into adapted varieties as opposed breeding with single gene considered more effective method combat races, but success pyramiding depends on availability molecular markers tightly linked genes. Markers for Ug99‐effective genes, Sr2 , Sr22 Sr26 Sr32 Sr35 Sr39 Sr40 were evaluated usefulness marker‐assisted selection (MAS) hard winter (HWW) using 10 donor lines, 17 recently released U.S. HWW or 20 advanced introgression lines. XcsIH81‐BM XcsIH81‐AG Xsr26#43 XBE51879 Xbarc55 Xbarc51 Xrwg27 Xsr39#22r csSr2 ‐derived nucleotide polymorphism (SNP) marker are diagnostic set accessions this study. These should be useful develop cultivars multiple against races.