A DIALLEL CROSS ANALYSIS FOR SOME QUANTITATIVE CHARACTERS IN BREAD WHEAT ( Triticum aestivum L.) | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 16, Volume 82, Issue 4, December 2004, Page 1665-1679 PDF (3.72 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2004.275326 | ||||
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| Author | ||||
| EZ-ELDIN A. M. EL-SAYED | ||||
| National Wheat Research Program, Field Crops Research Institute, Agricultural Research Center, Giza, Egypt | ||||
| Abstract | ||||
| A diallel crass among seven bread wheat genotypes (parents) namely; Shakha 8, Sakha 69, Sids 1, Attila, Opata, Line 88 and Giza 168 were evaluated for yield and its components as well as some other agronomic characters in the Fl and F2 generations. Genotypes mean squares were significant for ail studied characters. Mean squares for parents vs crosses as an indication for heteroasis were significant for all studied characters in the Fl and F2 except for number of spikelets/spike in the F1 and F3 and for maturiety date in the F2 only. Both general and specific combining ability (GCA and SCA, respectively), were significant for all studied characters in the F1 and F2, except for number of spikelets/spike, number of kemels/spike in the F1 and for maturity date in the F2. These results indicate the importance of both additive and dominance genetic variance in the inheritance of most characters. However, the additive gene action (GCA) was of great importance in the performance of most studied characters. Moreover, the parents P6 (Line 88) and P3 (sids 1) were the best combiners for grain yield. Meanwhile, significant SCA effects for grain yield were found in the crosses between Pi x P3, P2 XP5 and P4 x P5 in the Fl and P1 x P3, Pi x134 and P4 x P6 in the F2. The additive variance effects were significant for all studied characters except for 100 kernel weight in the F1 and was significant for most characters in the F2. Over dominance effects of heterozygous loci were significant for most studied characters in the F, and F2 Values of H2/41-11 analysis being less than 0.25 indicated asymmetric distribution of positive and negative alleles among parents for all characters in the F1 and F3 ; except for maturity date in the F2. On the other hand, narrow sense heritability was low for some characters , indicating the importance non-additive genetic effects. | ||||
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