HETEROSIS AND COMBINING ABILITY ANALYSIS OF SOME BREAD WHEAT CROSSES | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 14, Volume 84, Issue 4, December 2006, Page 1147-1155 PDF (2.11 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2006.233559 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| WAFAA A. M. EL AWADY | ||||
| Field Crops Research Institute, Agricultural Research Center, Giza, Egypt | ||||
| Abstract | ||||
| A half diallel Fl cross among five bread wheat genotypes, namely Sids 7, Sakha 69, Gemmiza 9, Giza 168 and Sids 1 was evaluated for yield and its components. Heterotic effects were mainly attributed to over dominance effects. Average potence ratios revealed over dominance for the decreased number of spikes/plant, increased number of kemels/spike and higher grain yield. Absent dominance of kernel weight resulted from existence both negative and positive dominance. The results detected significant general and specific combining ability (GCA and SCA, respectivety) for all studied characters. GCA/SCA ratios indicated the importance of additive gene action in the expression of all characters, except for kernel weight The parents, Gemmiza 9, Gin 168 and Sids1 are good combiners for number of spikes/plant and grain yield. Meanwhile, significant SCA effects were found for the crosses (Sakha 69 x Gin 168), (Sakha 69 x Sids 1), (Gemmiza 9 x Giza 168), (Giza 168 x Sids 1) for grain yield and at least one of the yield components, with considerable heterotic effects. | ||||
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