The objective of this study was to determine magnitude of heterosis for yield and oil content in sunflower. For this purpose, a study was conducted during 2003-2004 at NWFP Agricultural University, Peshawar on a diallel cross of sunflower to find out the extent of heterosis for achene yield (kg ha-1) and oil content (g kg-1). Heterosis was observed for these both parameters. The magnitude of heterosis of F1 over mid-parent was 1.29 in direct crosses while 3.73% in reciprocal crosses for achene yield ha-1. Similarly the magnitude of heterosis for oil content was 31.19 in direct crosses while this magnitude was 5.71% in reciprocal crosses for oil content in sunflower. The study showed that the direct and reciprocal crosses showed totally different magnitude of heterosis for both traits studied. In cross combinations heterosis for both traits was more in those crosses where parents were phenotypically at distance.
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Masood Jan, Farhatullah, Ijaz Begum, Ghulam Hassan and Iftikhar Khalil, 2005. Magnitude of Heterosis for Achene Yield and Oil Content in Sunflower (Helianthus annuus L.). Pakistan Journal of Biological Sciences, 8: 1557-1560.