Sources of resistance in Brassica juncea lines against Albugo candida

A series of PWR (Pant-white rust), PAB (Pant-Alternaria Blight) and PRD (Pant-Rai Disease) B. juncea lines were screened under field (epiphytotic) conditions and glasshouse conditions at cotyledonary and true leaf stage for confirmation of resistance against Albugo candida (white rust disease). In field all PWR lines were found immune, however, among PRD lines, 23 lines were moderately resistant and 6 were moderately susceptible, among PAB lines, 16 lines were moderately resistant and 11 were susceptible against white rust disease at 90 days after sowing. All the PWR, PRD and PAB lines were further tested in glasshouse, at cotyledonary and true leaf stage for confirmation. The PWR lines which were free from the disease at field conditions at cotyledonary leaf stage only showed immune reaction and six showed resistant reactions. However, at true leaf stage none of the lines showed immune reaction, 01 line showed highly resistant reaction and 03 lines showed resistant reactions. Present study revealed that the glass house study is more appropriate method for screening of resistance against white rust as actual resistance is obtained. Earlier cotyledonary stage was recommended for the confirmation of the resistant sources however, the present findings revealed that in glasshouse, true leaf stage is most important for the confirmation.