Genetics of rust resistance in tetraploid wheats. III. Genes for resistance to stem rust in certain Durum wheats

Abstract

The inheritance of resistance to stem rust in four durum wheats, namely P.I.168921, P.I.173401, Gaza, and C.I.7809 was studied. The variety P.I.168921 was found to possess two dominant genes Srt1 and Srt5, P.I.173401 two recessive genes srt6 and srt7, Gaza two dominant genes Srt8 and Srt9, and C.I.7809 genes Srt33 and Srt10, for resistance to Australian strains of Puccinia graminis tritici Erikss. & Henn. It was observed that the genes srt6, srt7, Srt9, and Srt10 were independent of genes already identified. Varieties Khapli, St.464, C.I.7778, and P.I.168921 had gene Srt1Srt1 in common; and varieties St.464, C.I.7778, and C.I.7809 gene Srt3 in common.