Genetic variability, association and path analysis in Indian mustard (Brassica juncea)

Abstract

Ninety diverse genotypes of Indian mustard [Brassica juncea (L.) Czern & Coss.] were evaluated for
fifteen quantitative traits. Both phenotypic and genotypic coefficients of variation were higher for important
traits including number of secondary branches/ plant, seed yield/ plant, and 1000-seed weight. High
heritability in conjunction with high genetic advance were observed for seed yield/ plant, number of
secondary branches/ plant, 1000- seed weight, number of seeds/ siliqua, primary branch angle, number of
primary branches/ plant, siliqua angle, siliquae on main shoot, and siliqua length suggesting predominant role
of additive gene action for expression of these traits. Seed yield/ plant was found to be positively and
significantly correlated with number of primary branches/ plant, number of secondary branches/ plant,
primary branch angle, main shoot length, siliqua length, and number of seeds/ siliqua; seed yield/ plant had
negative association with oil content. Path analysis revealed that main shoot length, number of primary
branches/ plant, number of seeds/ siliqua, and primary branch angle showed positive direct effect on seed
yield/ plant which suggested that selection for number of primary branches/ plant, primary branch angle, main
shoot length, number of seeds/ siliqua would be quite effective in improving seed yield in Indian mustard.