Genetic divergence in Indian mustard

摘要

The nature and magnitude of genetic divergence and the characters contributing to genetic diversity were studied among 43 genotypes of Indian mustard using D2 statistics. In the rabi seasons of 1999 (E1) and 2000 (E2), 13 homozygous diverse lines and their 30 F1 hybrids derived from a 10x3 line x tester mating design were evaluated. Observations were recorded for plant height, primary branches, secondary branches, main shoot length, siliquae on main shoot, siliqua length, seeds per siliqua, 1000-seed weight, seed yield per plant and oil content. Days to 50% flowering and days to maturity were recorded on plot basis. Based on divergence analysis, the genotypes were grouped into 6 and 15 clusters, respectively, and the highest number of genotypes were included in cluster I in both the environments. The intra-cluster distances were almost equal and relatively lower than the inter-cluster distances. Days to 50% flowering (10.42%, 8.91%), days to maturity (23.80%, 22.64%), plant height (31.02%, 31.54%), primary branches (0.99%, 0.91%), secondary branches (2.31%, 1.92%), main shoot length (11.29%, 12.88%), siliquae on main shoot (6.83%, 7.77%), siliqua length (0.64%, 0.68%), seeds per siliqua (1.93%, 1.97%), 1000-seed weight (0.84%, 0.79%), seed-yield per plant (4.42%, 3.47%) and oil content (6.27%, 6.48%) contributed to total divergence in varietal improvement programme.