The inheritance of resistance to stem rust races 56 and 15B-1L (Can.) in the wheat varieties Hope and H-44

The inheritance of resistance to races 56 and 15B-1L was studied in back-crosses of Hope and H-44 to Marquis. The results indicated that both varieties carry the same three genes. Resistance to race 56 is controlled by two dominant genes, Sr 1 which conditions seedling or physiological resistance and Sr 2 which conditions adult plant resistance. At either the seedling or adult plant stage both genes must be present to provide full resistance to race 56. A single recessive gene, not yet named, provides resistance to race 15B-1L.The gene Sr 1 was transferred from Hope to Marquis by backcrossing and the line was crossed to the Chinese Spring monosomics. The gene proved to be on chromosome 2B (XIII).