Inheritance of white rust resistance in Indian mustard incorporated from Brassica napus

Abstract

The mode of Inheritance of white rust (Albugo candida) resistance In three strains S-II, S-IV (R) and S-VI Incorporated from Brassica napus and stabilized as Brasslca /uncea was studied by crossing with susceptible strains S-VIII, Pusa Bold and S-IX(S) and raising their F1, F2, B1 and B2 generations. The F2 and backcross populations from all the three crosses segregated for a dominant gene. These results were also confirmed when tested at two hotspots Wellington and Kukumseri. It was concluded from the segregation pattern of inter-crosses between resistant strains that the same gene for white rust resistance Is operating In all the three parents. The monogenic dominant Inheritance was also confirmed when resistant strains were crossed with white rust resistance gene carrier strain deriving resistance from B. carinata.