Combining ability studies for some polygenic traits in Aestivum spp.
1999
Chowdhry, M.A. (University of Agriculture, Faisalabad (Pakistan). Dept. of Plant Breeding and Genetics) | Rabbani, G. | Subhani, G.M. | Khaliq, I.
Combining ability of some polygenic traits was studied in a set of diallel cross involving five varieties/lines of bread wheat. Mean squares for general combining ability were highly significant for plant height; extrusion length, grains per spike, 1000-grain weight and grain yield per plant and non-significant for flag leaf area, tillers per plant and spikelets per spike. Mean squares for specific combining ability were highly significant for plant height, flag leaf area, tillers per plant, extrusion length, grains per spike, 1000-grain weight and grain yield per plant and non-significant for spikelets per spike. Mean squares for reciprocal effects were also highly significant for plant height, tillers per plant, extrusion length, grains per spike, 1000-grain weight and grain yield per plant, significant for spikelets per spike. The magnitude of sigma square base s was higher than sigma square base g for all the traits except spikelets per spike. Hence non-additive gene effects were important in the inheritance of all traits except spikelet per spike. The parent genotypes, 7028 and Rohtas 90 and hybrids Parwaz 94 x Pitic 62, Rohtas 90 x Pitic 62 had high GCA and SCA effects, respectively and they could be exploited for further selection of high yielding progenies.
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