Wheat Sr Genes
A number of stem rust resistance genes (Sr genes) have been identified in wheat. Some of them arose in bread wheat (e.g. Sr5 and Sr6), while others have been bred in from other wheat species (e.g. Sr21 from T. monococcum) or from other members of the tribe Triticeae (e.g. Sr31 from rye and Sr44 from Thinopyrum intermedium).
None of the Sr genes provide resistance to all races of stem rust. For instance many of them are ineffective against the Ug99 lineage. Notably Ug99 has virulence against Sr31, which was effective against all previous stem rust races.
Singh et al., provide a list of known Sr genes and their effectiveness against Ug99.
Read more about this topic: Stem Rust
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