PJB-2000-42
ESTIMATION OF SELECTION INDICES IN BRASSICA JUNCEA L. AND BRASSICA NAPUS L.
A.S. LARIK AND L.S. RAJPUT
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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