Genetic variability and diversity play a major role in framing successful breeding programme. It is evident that genetically diverse parents are likely to produce high heterotic effects and yield desirable transgressive segregants. Keeping this in view, the present study was conducted to evaluate nature and extent of genetic variability and diversity in Indian mustard [Brassica juncea (L.) Czern. & Coss.]. About 31 genotypes including local, indigenous and exotic germplasm lines were evaluated in randomized complete block design with three replications across two environments during rabi 2008-09 and 2009-10. | Genetic variability and divergence studies for seed yield and component characters in Indian mustard Brassica juncea l. Czern. coss. over environments