GENETIC ANALYSIS FOR YIELD AND ITS ATTRIBUTES IN BREAD WHEAT | ||||
| Journal of Plant Production | ||||
| Article 1, Volume 30, Issue 4, April 2005, Page 1827-1838 PDF (838.65 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2005.237198 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| R. M. Koumber,1; I. E. M. A. El-Beially2 | ||||
| 1Wheat Department, Field Crops Research, institute, A.R.C., Egypt | ||||
| 2Department of Agronomy, Faculty of Agriculture, Al-Azhar University , Cairo, Egypt. | ||||
| Abstract | ||||
| This investigation was carried out at the farm of El‘Gemmeiza Agricultural Research Station. Agricultural Research Center. Egypt. during 20022003 and 200312004 seasons. Six parental lines of bread wheat were used in a half-diallel cross to produce Fr. crosses. Combining ability. heterosis. type of gene action and heritabilitywere estimated for days to heading. plant height. Spike length. number of headed tillers/plant. number of kernelsfspike. tOOO-kernel weight and grain yieldi'plant .Gn‘ffing. Mather and Jinks and Hayman methods were used to estimate these parameters. Significant mean squares were obtained tor genotypes. parents. crosses for all traits studied. Kaman-2 and Sakha 59 were at the top of the tested parents in grain yield/plant. The two crosses( Sakha 69 x Sids 7) and (Sakha 69 x Giza 170) gave the highest values of grain yieldiplant. The mean squares due to general combining ability (GCA) and specific combining ability (SCA) were significant, for all traits studied which indicated the presence of both additive and non-additive types of gene action including dominance. The ratios of GCNSCA were more than unity in all traits which indicated that additive gene effects were more important than dominance in the performance of these traits. The estimates of heterosis for grain yieldlplant indicated that twelve out of fifteen crosses exhibited positive and significant heterosis relatively to mid parents. while five crosses out of fifteen crosses exhibited positive and significant heterosis relatively to better parent. All H; (the component of variation due to the dominance portion associated with gene distribution values were smaller than H1 (the dominance component of variation) values for all the studied traits. indicating unequal allele frequency. Values oi (HrlD) “ were higher than‘units for most traits indicating over dominance However spike length exhibited (H«.!D)’9 was less than unity suggesting the existence of partial dominance effect The values of H2l4Hr for all traits were less than D 25 for all the studied traits. indicating unequal distribution of dominant and recessive alleles among the parents. Narrow sense heritability was high for days to heading. spike length. moderate for number of headed tillers. number of kernels spike and lOOO—kernel weight and low for plant height and grain yieldiplant. | ||||
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