Inheritance Studies in Wheat—VII. Inheritance of Seedling Reaction to Physiologic Races 24 and 117 of Puccinia Graminis Tritici in some Intervarietal Crosses of Common Bread Wheat

Results of studies conducted with a view to finding out the number of genes involved in controlling seedling resistance of N.P. 790, E. 1913, E. 572 (Ridley) and E. 871 to races 24 and 117 of stem rust are reported.

Resistance of N.P. 790 and E. 572 to races 24 and 117 was observed to be governed by two pairs of dominant duplicate genes.

Three pairs of duplicate dominant genes were found to determine the resistance of E. 1913 to races 24 and 117.

E. 871 (Timstein X 2086 Sel. 1495A-1-7-3-1) was found to carry one pair of dominant factors for resistance to races 24 and 117.

Further studies are needed to show whether the genes governing resistance to the two races are the same or different.