Estimation of selection indices in Brassica juncea L. and Brassica napus L.
2000
Larik, A.S. | Rajput, L.S.,Sindh Agriculture Univ., Tandojam (Pakistan). Dept.of Plant Breeding and Genetics
Genetic selection indices were studied for six productive traits in twovarieties (S-9 and S-95) of Brassica juncea and four varieties (Canola-I, II, IIIand Canola standard) of B. napus. Correlation analysis indicated that seedyield/plant had strong positive association with plant height, branches/plant,siliqua/ plant, seeds/siliqua and dry matter yield/plant. Path analysis andselection indices also confirmed that all the traits contributed significantlytowards seed yield/plant. The direct and indirect effects were found to beregulating the character association in all the traits. Magnitude of genetic andphenotypic variance ranged between 0.555 (seed yield/plant) to 960.63(siliqua/plant), respectively. Heritability (b.s) showed high estimates (rangingfrom 97.70% to 60.24%) for all the traits, indicating the involvement of additivegene action. Dry matter yield/plant, seeds/siliqua and plant height exhibited lowgenetic advance irrespective of their high heritability estimates, probably due tonon-additive gene (dominance and epitasis) effects. On the basis of selectionindices, it is concluded that branches/plant and siliqua/plant are the mostimportant yield components, therefore, selection based on these traits could beexploited for the improvement of yield in present genotypes.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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