Division of Genetics, Indian Agricultural Research Institute, New Delhi
Online published on 25 January, 2012.
Mode of inheritance of seedling resistance of four semi-dwarf wheat varieties Chhoti Lerma, Kalyansona, Sharbati Sonora and Sonalika an crosses with susceptible wheat NP 4 was studied against races 15, 17, 122, 194, 21-A-l and 34-A of stem rust.
Single dominant genes in Chhoti Lerma were found to govern resistance to races 15, 17, 34-A and 194 and two recessive genes for each of the races at 21-A-l and 122. The single dominant genes for races 17 and 34-A and one of the two recessive genes for race 122 were found to be linked together. Also the single dominant genes for races 15 and 194 were found linked with each other. Lerma Rojo, Newthatch, Yaqui and Kenya wheats were assumed to be responsible for providing resistance to Chhoti Lerma against races 15, 17, 122, 194, 21-A-l and 34-A.
Linkage was detected between the single dominant genes in Kalyansona conferring resistance against races 15, 17 and 194. Also two independent complementary genes were reported for race 21-A-l. The resistant genes were evidently contributed to Kalyansona from Newthatch, Timstein, Gabo and Kenya wheats.
Two dominant duplicate genes in Sharbati Sonora determined its ssedling resistance to each of the races 15, 17 and 194 and one dominant gene to race 21-A-l. This single gene for race 21-A-l appeared to be linked with one of the two genes which governed resistance to each of the races 17 and 194. The genes for races 17 and 194 were found to be linked together. Sharbati Sonora appears to have acquired its resistance genes from Timstein, Newthatch, Yaqui and Kenya wheats.
The test for linkage showed the association between the single dominant genes in Sonalika, conferring seedling resistance against races 15 and 17. Two dominant complementary genes conferred confused resistance against race 21-A-l. These genes for resistance in Sonalika seem to have been obtained from Newthatch, Yaqui and Kenya wheats.
