Varietal screening and molecular analysis against alternaria blight in Indian mustard genotypes

Indian mustard [Brassica juncea (L.) Czern 8#x38;#x38; Coss] is an important edible oilseed crop in India. There are 154 genotypes screened under natural condition against Alternaria blight. Disease appeared on leaves after 90 days were noted as, 9 genotypes found moderately susceptible (Rohini, PAB-14-14, PBZ-4, PRD-14-1, PAB-14-5, PRD-14-16, PAB- 14-17, PHR-2, Parvati), 29 were susceptible and 116 were highly susceptible. In case of biochemical analysis, only ten genotypes, maximum phenolic value in non-infected and infected leaves was in found same variety NDRS-2009-1 and peroxidase activity maximum values was found non-infected and infected leaves NDRE-1-11-1, Vaibhav. In catalase activity, a height value was found non-infected and infected leaves varieties NDRS-2007, NDRS-2009-1. Cluster analysis dendogram is divided in two group I and II, these similarity showing mean 0.45 and group I had only one variety namely NDRS-2009- 1. Group II had divided in to two sub groups A and B. Group A is in to two clusters A1 and A2 in this group similarly 0.60 and cluster A1 divided in to two sub cluster A1-1 and A1-2, sub cluster A1-1 had found three varieties NDRE-1-11-1, NDYR-2008 and Narendra Rai but NDRE-1-11-1 0.75 more similar both varieties NDYR-2008 and Narendra Rai. Sub cluster A1-2 had two varieties Vaibhav and Rohini both similar only 0.70. Cluster A2 had found three varieties NDRE -7, Vardan and PM-26 but both NDRE -7, Vardan dissimilar 0.81 then PM-26 and group B had found only one variety NDRS-2007.