Creation of genetic variability and development of varieties having higher yield potential depends on information about nature of gene action. The present investigation was undertaken to decipher the nature of gene action and allied genetic parameters involved in the inheritance of yield and yield-related component traits in opium poppy ( L.). The biparental inbreeding progenies derived from four segregating base populations of crosses NB-1Kr40-3/3×NB-1Kr30+0.2-2/1, NB-5Kr40-7/2×58/1, NB-1Kr30+0.2-2/1×58/1 and NB-Kr40-3/3×NB-5Kr40-7/2 of opium poppy were analysed to study the gene actions involved in the inheritance of yield and component traits. Additive component of variance played a predominant role in North Carolina design (NCD)-I, while both additive and dominance genetic components were found important in NCD-III design. The presence of additive as well as nonadditive components of variance suggested that one or two generations of intermating in further generations followed by selection may lead to development of novel genotypes.
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