(Combining Ability and Gene Action Controlling Morpho-Agronomical Traits in Bread Wheat Genotypes under Non-Stressed and Drought-Stressed Conditions) | ||
| Journal of Sohag Agriscience (JSAS) | ||
| Volume 10, Issue 1, June 2025, Pages 204-220 PDF (1.5 M) | ||
| Document Type: Research and Review Papers | ||
| DOI: 10.21608/jsasj.2025.440413 | ||
| Authors | ||
| Zeinab Z. A. Farhan; Galal A. R. El-Sherbeny; Emdeldin A Maher; Abdelsabour G. A. Khaled* | ||
| Genetics Department Faculty of Agriculture Sohag University Sohag Egypt | ||
| Abstract | ||
| The study assessed six parents of bread wheat and their 15 F1 crosses under normal and drought stress conditions to evaluate genotypic variation. Results showed highly significant genotypic and genotype-environment (G × E) interactions across all traits, indicating substantial variability and differential responses among genotypes. Under normal conditions, Diebera and Pectora were earliest to flower, while Canada-462 and Giza-171 were earliest under drought. Canada-462, Diebera, and Sids-12 consistently exhibited superior performance for traits like plant height, spike length, and grain yield. Their crosses, particularly P1 × P2, P1 × P3, and P2 × P6, also performed best under both conditions. Drought stress caused notable reductions in all traits, especially grain yield (up to 21.07% in parents). Drought susceptibility index (DSI) identified tolerant parents (Pectora, Sahel-1, Giza-171, and Sids-12) and crosses (e.g., P4 × P6, P5 × P6). Combining ability analysis showed that both additive (GCA) and non-additive (SCA) gene actions were significant, with non-additive effects predominating in most traits. Heritability estimates were higher in broad sense than narrow sense. Overall, the results highlight promising parents and crosses for breeding drought-tolerant wheat with enhanced yield and adaptability, emphasizing the utility of both additive and dominance gene actions in selection strategies. | ||
| Keywords | ||
| Bread wheat; genotypic variation; drought stress; Genetic parameters | ||
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