DIALLEL CROSSES ANALYSIS FOR YIELD AND ITS COMPONENTS IN BREAD WHEAT | ||||
| Journal of Plant Production | ||||
| Article 1, Volume 30, Issue 10, October 2005, Page 5725-5738 PDF (3.87 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2005.237489 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Nadia A. R. Abdel Nour,; H. A. Ashoush; Sabah H. Abo Elela | ||||
| Wheat Research Dept. Field Crops Research Institute; A.R.C., Egypt | ||||
| Abstract | ||||
| A half diallel cross among seven bread wheat genotypes (Parents) namely R.C.B 143, R.C.B 70, R.C.B 122, Sakha 202, Sakha 206, Gemmeiza 7 and Sids1 were evaluated for yield and its components as well as some other agronomic characters in the F1 and F2 generations. Genotypes mean squares were significant for all studied characters. Mean squares for parents In Crosses as an indication for heterosis were significant for all studied cheracters in the F1 and F2, except plant height and 1000-kernel weight in F1 and spike length, 1000-kernel and grain yield in F2. Both general and spacific combining ability (GCA and SCA), were significant for all studid characters in the F1 and F2, except SCA for plant height in F1 and spike length in F1 and F2. These results indicate the importance of both additive and dominance genetic variance in the inheritance of most characters. Though most of estimates of not GCAlSCA exceeded unty, most of then was not significant to show the probablity of equal importance of both addition and non-addition gene action. Moreover, the parents P4 (R.C.B 122) and P5 (R.C.B 70) were the best combiners for grain yield in F1 and F2 but P6 (Gemmiza 7) in F1 only. Meanwhile, significant SCA effects for grain yield were found In the crosses between (P1xP3), (P1xP7), (P2xP4), (P2xP6), (P3xP4), (P4xP7), (P5xP6) an (P5xP7) in the F1 and (P1xP3), (P2xP3), (P3xP7), (P4xP5), (P4xP6), and (P5xP7), in the F2. The additive variance effects were significant for all studied characters except for 1000 kernel weight, grain yield and total plant weight in the F1, being significant for most characters in the F2. Over dominance effects of heterozygous loci were significant for most studied characters in the F1 and F2. Values of (H2I4H1) analysis being less than 0.25 indicated asymmetric distribution of positive and negative alleles among parents for all characters in the F1 and F2. On the other hand, narrow sense heritability was low for some characters, indicating the importance non-additive genetic effects. | ||||
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