STUDIES OF GENE EFFECT ON YIELD AND YIELD COMPONENTS FOR SOME BREAD WHEAT CROSSES | ||||
| Journal of Plant Production | ||||
| Article 1, Volume 31, Issue 6, June 2006, Page 3273-3283 PDF (3.12 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2006.236019 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| M. Kh. Moshref, | ||||
| National Wheat Res. Program, Field Crops Res.lnst., Agric. Res. Center | ||||
| Abstract | ||||
| Three experiments were carried out at EI-Giza Agricultural Research Station using two wheat crosses namely, Gemmeiza 7 x Sids 1 and Giza 168 x Sakha 93. Six populations (P1, P2, F1, Fa, BC1 and BC2) for each cross were used in this investigation. Significant positive heterotic effects were obtained for plant height, grain yield/plant and biological yield/plant in the first cross while, heterotic increase in number of spikes/plant, 1 OO-kernel weight, grain yield/plant and biological yield/plant seemed to be accounted for the heterotic response observed in the second cross. On the other hand, significant negative heterotic effect was found for number of grains/spike in the second one. Inbreeding depression estimates were found to be significant for all studied attributes except for number of spikes/plant in the first cross. Over dominance towards the higher parent for 100-kernel weight, grain yield/plant and biological yield/plant, no. of spikes/plant, were observed in both crosses. Meanwhile, over or partial dominance towards the lower parent was obtained for number of kernels/spike in the two crosses. On the other side partial dominance was observed for plant height in the second one. F2 deviation (E1) were significant for number of kernels/spike in the two crosses, and for grain yield/plant in the first cross. Moreover, backcross deviations (E2) were significant for plant height in the first cross, number of kernels/spike, grain and biological yield/plant in the second one. The additive gene effect was significant for all studied characters in Gemmeiza 7 x Sids 1 cross except for number of spikes/plant. These results suggest the potential for obtaining further improvement in most studied characters. In addition, dominance anc epistasis were found to be significant ror some of the studied attributes. High to medium values of heritability estimates were found to be associated with high and moderate genetiC advance as percentage of F2 mean in most characters. These results indicated that selection for the studied characters could be useful in the early generations. | ||||
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