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Pakistan Journal of Biological Sciences

Year: 1999  |  Volume: 2  |  Issue: 2  |  Page No.: 434 - 437

Combining Ability Studies For Some Polygenic Traits in Aestivum spp.

Muhammad Aslam Chowdhry, Ghulam Rabbani, Ghulam Mahboob Subhani and Ihsan Khaliq

Abstract

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 variance (s) was higher than variance (g) for all the traits except spikelets per spike. Hence non-additive gene effects were important in the inheritance of all traits except spikelets 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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