Analysis of combining ability effects and for yield traits in F1 and F2 generation of in Winter wheat x spring wheat cross combinations (Triticum aestivum L.) under rainfed conditions

Abstract

The present investigation was carried out at the research farm of the Division of Plant Breeding & Genetics, SKUAST –Jammu, Chatha. The experimental material of the present study comprised 20 true breeding facultative type winter wheat lines which were evaluated under rainfed conditions in a RBD. The best ten winter wheat lines (Arkaan, Blue boy, China 4435893, Drina, Drina NS 720, Nordersprez, WW12, WW21, WW23 and WW25) used as females and three spring wheat (PBW175, PBW 644 and WH 1080) were used as male parents to develop the experimental material for line x tester mating design. 30F1s and advanced 30F2 seeds along with 13 parents were sown in the Rabi 2016-17 in a RBD under rainfed conditions. Observations were recorded on yield traits. The mean squares for comparisons of parents’ vs crosses were significant. Combining ability analysis carried over F1 and F2 generation revealed that variance for crosses, testers and partly in lines was significant for almost all the traits. The GCA effects were greater than SCA effects for most of the traits. The compassion of relative magnitude of GCA and SCA variances indicated greater magnitude of GCA variance than SCA variance yield traits indicating the presence of additive gene action for the inheritance of these traits. On the basis of overall ranking of the parents for GCA, the lines Arkaan, Blue boy, Nordersprez, Drina and WW25 and in testers WH1080, PBW 175 revealed desirable significant effect for many traits.).