PJB-2000-42
ESTIMATION OF SELECTION INDICES IN BRASSICA JUNCEA L. AND BRASSICA NAPUS L.
A.S. LARIK AND L.S. RAJPUT
DOI:
Abstract
Genetic selection indices were studied for six productive traits in two varieties (S-9 and S-95) of Brassica juncea and four varieties (Canola-l,II,III and Canola standard) of B. napus. Correlation analysis indicated that seed yield/plant had strong positive association with plant height, branches/plant, siliqua/ plant, seeds/siliqua and dry matter yield/plant. Path analysis and selection indices also confirmed that all the traits contributed significantly towards seed yield/plant. The direct and indirect effects were found to be regulating the character association in all the traits. Magnitude of genetic and phenotypic variance ranged between 0.555 (seed yield/plant) to 960.63 (siliqua/plant), respectively. Heritability (b.s) showed high estimates (ranging from 97.70% to 60.24%) for all the traits, indicating the involvement of additive gene action. Dry matter yield/plant, seeds/siliqua and plant height exhibited low genetic advance irrespective of their high heritability estimates, probably due to non-additive gene (dominance and epistasis) effects. On the basis of selection indices, it is concluded that branches/plant and siliqua/plant are the most important yield components, therefore, selection based on these traits could be exploited for the improvement of yeild in present genotypes.
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