Back to Contents

FREE FULL TEXT PDF

MAGNITUDE OF COMBINING ABILITY OF SUNFLOWER GENOTYPES IN DIFFERENT ENVIRONMENTS

 HAKIM KHAN¹, HIDAYAT-UR-RAHMAN², HABIB AHMAD³, HAIDAR ALI⁴, INAMULLAH³ AND MUKHTAR ALAM³

Abstract: Five cytoplasmic male sterile (CMS) lines and 5 restorers of sunflower were used, in a line x tester fashions at two locations over two years to determine the magnitude of combining ability and mode of gene action. The traits studied were days to 50% flowering, days to maturity, 1000-seed weight, seeds head^-1, oil content, and seed yield. The general combining ability (GCA) and specific combining ability (SCA) effects were significant for all parameters. The SCA effects were of greater magnitude than GCA effects, which showed greater manifestation of non-additive gene effects. The GCA:SCA ratio also revealed predominance of non-additive gene effects. Performance of TS-18 and TS-335 among the CMS and TR-5 and TR-13 among the restorers was better for most of the traits. CMS lines TS-4 and TS-335 and restorer TR-5 and TR-6023 were better general combiners for most of the traits at both locations. Not a single cross combination showed consistent promising results for all traits, however, the cross combinations TS-17 x TR-6, TS-18 x TR-5, TS-335 x TR-3 and TS-17 x TR-13 showed higher specific combining ability effects for seed yield at Peshawar. At Mansehra TS-11 x TR-6023, TS-17 x TR-6, TS-4 x TR-3 and TS-335 x TR-5 had higher specific combining ability effects for seed yield.

¹Agricultural Research Station Baffa, Mansehra, Pakistan

²Department of Plant Breeding and Genetics, NWFP Agricultural University, Peshawar, Pakistan

³Department of Genetics Hazara University Mansehra, Pakistan

4Department of Botany, University of Karachi