INHERITANCE OF RESISTANCE TO Albugo Candida Race 2 IN MUSTARD ( Brassica Juncea (L.) Czern.)

Abstract

The inheritance of resistance to white rust (Albugo Candida) race 2 in mustard (Brassica juncea) was studied in crosses involving one resistant and two susceptible cultivars. Inoculations were made in a growth chamber followed by growth of the plants under greenhouse conditions. The reaction of the F 1 was like the resistant parent, indicating that resistance is dominant and controlled by nuclear genes. Backcrosses of F 1 plants to the resistant parent showed the same reactions as that of the resistant parent. Backcrosses of F 1 to the susceptible parents segregated in a 1:1 ratio of resistant to susceptible. The F 2 segregation of resistant and susceptible plants gave a good fit to a 3:1 ratio. The study revealed that resistance is monogenic and could be easily transferred to adapted susceptible genotypes via backcrossing.Key words: Brassica juncea, Albugo Candida, mustard, white rust