A study on a 8x8 diallel fashion in sunflower was conducted at NWFP Agricultural University Peshawar Pakistan. The genetic analysis showed that additive and non-additive effects were significant for achene yield (kg ha-1). The maternal and non-maternal reciprocal effects were also controlling the inheritance of the trait. The non-additive effect was more pronounced from H1>D. The Wr/Vr did not give a slope so the mean degree of dominance (H1/D)1/2 better reflected the overdominance effect for the trait. In case of oil content, the Hayman complete analysis suggested the involvement of additive and non-additive components of variation. Dominance genetic vrainaces H1 and H2 were also significant indicated that genetic variances for oil content was under control of both additive and non-additive effects. The Wr/Vr graph indicated that overdominance is controlling oil content in these genetic materials. The heritability estimates in broad sense were from moderate to high while heritability estimates in narrow sense were low to moderate for both the traits.
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Masood Jan, Farhatullah, Muhammad Tariq Jan, Ghulam Hassan and Raziudin, 2005. Gene Action in the Expression of Achene Yield and Oil Content in Sunflower (Helianthus annuus L.). Pakistan Journal of Biological Sciences, 8: 1517-1520.