THE INHERITANCE OF RUST RESISTANCE.: IV. MONOSOMIC ANALYSIS OF RUST RESISTANCE AND SOME OTHER CHARACTERS IN SIX VARIETIES OF WHEAT INCLUDING GABO AND KENYA FARMER

In previous papers in this series, 7 genes, designated Sr6–Sr12, controlling resistance to stem rust were identified. To determine the chromosomes carrying these genes, each of the 21 Chinese monosomics was crossed with the varieties, Gabo, Kenya Farmer, Egypt Na95 and Veadeiro. In addition mono-X was crossed with Lee and mono-XX with Red Egyptian. The F 2 populations from the crosses were tested with either or both of races 15B and 56 and in some cases were classified for other characters.The gene Sr7 was found to be on chromosome VIII but not linked to the gene Hd (Hooded). The locations of genes Sr6, Sr8, Sr9, Sr11 and Sr12 have been reported by other authors and were confirmed as follows: Sr6—chromosome XX, Sr8—chromosome VI, Sr9—chromosome XIII, Sr11 and Sr12—chromosome X (28% recombination).